Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
Hi all, Am wanting to get some advise on how to write this Perl script. I have a backup directory that I have to check for the existence of file/s and if the latest file that exist there is 2 days old, that means I have a problem and had to send an email notification. To illustrate if, for example, a directory named /backup have the following files and their timestamps: /backup/file.01 01-Jan-2011 0500 /backup/file.02 02-Jan-2011 0500 /backup/file.03 03-Jan-2011 0500 .. .. /backup/file.31 31-Jan-2011 0500 /backup/file.32 01-Feb-2011 0500 /backup/file.33 02-Feb-2011 0500 I want the script to check the most recent file in a backup directory, i.e. newest, for example /backup/file.33 and display the timestamp, i.e. date and time, of the file. Then I want to compare it with today's date and display the date/time difference in n days n hours n minutes. If the file is more than 2 days old, that should mean that the backup did not run so I have to send an email notification. So for example, if today is 04-Feb-2011 1000 0800 and there is no backup file created on 03-Feb-2011, when the script runs, it should detect that the most recent backup file is file.33, computed that it is older than 2 days and then send en email notification. Sample output from the script should be as below: === Checking last backup file on 04-Feb-2011 10:05: Last backup file = /backup/file.33 Timestamp = 02-Feb-2011 05:00 The file is = 2 days 5 hour/s 5 minute/s old Send email notification to check backup === My main hurdle is the file timestamp and date arithmetic part. Frm Google'ing, am leaning towards using stat which am hoping will work on both Unix and Windows. Some guidance will be much appreciated. Thanks in advance.
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
On 11-03-02 11:34 AM, newbie01 perl wrote: My main hurdle is the file timestamp and date arithmetic part. Frm Google'ing, am leaning towards using stat which am hoping will work on both Unix and Windows. Some guidance will be much appreciated. Thanks in advance. Use the stat function to get the mtime of the files. The one with the biggest is the most recent. Compare it to now and if now mtime + 2 * 24 * 60 * 60 then output your message. Use strftime() from POSIX to change the epoch seconds to human readable form. See: perldoc -f stat perldoc -f time perldoc -f localtime pelrdoc POSIX and search for /strftime/. -- Just my 0.0002 million dollars worth, Shawn Confusion is the first step of understanding. Programming is as much about organization and communication as it is about coding. The secret to great software: Fail early often. Eliminate software piracy: use only FLOSS. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
strawberry file end
Hi perlers, I am using strawberry portable for windows. In my tutorial they told my to read strings from keyboard (@array = STDIN) and told my to press ctrl+Z for the file end. But pressing ctrl+Z doesn't do anything. Can someone tell my what I have to do to simulate the EOF? Ctrl+D works for ending the file, but the hole script crashes, too. -- Yours sincerely, Christian Henkel www.HenkelChristian.de http://www.HenkelChristian.de?lang=en Tel: +49 176 63247825
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
First, use File::Find to get your info (or you could use system( ls -l ) and split - either way). To compare your time stamps, use DateTime and do dt1 - dt2
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
On 11-03-02 12:12 PM, shawn wilson wrote: First, use File::Find to get your info (or you could use system( ls -l ) and split - either way). To compare your time stamps, use DateTime and do dt1 - dt2 No. If you can do all your calculations using seconds from the epoch, then do so. Only convert them to human-readable form for the output. -- Just my 0.0002 million dollars worth, Shawn Confusion is the first step of understanding. Programming is as much about organization and communication as it is about coding. The secret to great software: Fail early often. Eliminate software piracy: use only FLOSS. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
On Mar 2, 2011 12:16 PM, Shawn H Corey shawnhco...@gmail.com wrote: On 11-03-02 12:12 PM, shawn wilson wrote: First, use File::Find to get your info (or you could use system( ls -l ) and split - either way). To compare your time stamps, use DateTime and do dt1 - dt2 No. If you can do all your calculations using seconds from the epoch, then do so. Only convert them to human-readable form for the output. Seems like more of a pain for a modest gain in speed to me. I like find and dt because its quick and easy. Either way though.
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
On 11-03-02 12:31 PM, shawn wilson wrote: Seems like more of a pain for a modest gain in speed to me. I like find and dt because its quick and easy. Either way though. No, because you don't have to worry about daylight-savings time or switching time zones. Seconds from the epoch is the same on all computers and in all time zones. -- Just my 0.0002 million dollars worth, Shawn Confusion is the first step of understanding. Programming is as much about organization and communication as it is about coding. The secret to great software: Fail early often. Eliminate software piracy: use only FLOSS. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Scan/Parse directory for newest file, print file timestamp and compute date/time difference - Some advice please
On 3/2/11 Wed Mar 2, 2011 8:34 AM, newbie01 perl newbie01.p...@gmail.com scribbled: Hi all, Am wanting to get some advise on how to write this Perl script. I have a backup directory that I have to check for the existence of file/s and if the latest file that exist there is 2 days old, that means I have a problem and had to send an email notification. To illustrate if, for example, a directory named /backup have the following files and their timestamps: /backup/file.01 01-Jan-2011 0500 /backup/file.02 02-Jan-2011 0500 /backup/file.03 03-Jan-2011 0500 .. .. /backup/file.31 31-Jan-2011 0500 /backup/file.32 01-Feb-2011 0500 /backup/file.33 02-Feb-2011 0500 I want the script to check the most recent file in a backup directory, i.e. newest, for example /backup/file.33 and display the timestamp, i.e. date and time, of the file. Then I want to compare it with today's date and display the date/time difference in n days n hours n minutes. If the file is more than 2 days old, that should mean that the backup did not run so I have to send an email notification. So for example, if today is 04-Feb-2011 1000 0800 and there is no backup file created on 03-Feb-2011, when the script runs, it should detect that the most recent backup file is file.33, computed that it is older than 2 days and then send en email notification. The file test operator -M, when applied to a file, will return the age of the file in days. Thus, you can use a test such as if( -M $filename 2 ) to determine if a file is more than 2 days old. See: perldoc -f -X -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Testing File Contents
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
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Re: How to list all Linux machines info with perl ?
In infinite wisdom sync jian...@gmail.com wrote: I have many linux machines connected in a network. Now I want ot create a perl script which will list all the machines info in a network. Check the collect tool, written by Percona guys http://aspersa.googlecode.com/svn/html/summary.html -- Raj Shekhar - If there's anything more important than my ego around, I want it caught and shot now. - Read the latest at my blog: Caching is not a silver bullet http://rajshekhar.net/blog/archives/397-Caching-is-not-a-silver-bullet.html -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Testing File Contents
# Untested
use strict;
use warnings;
open my $fh, '', my_file;
while($fh){
if ($_ !~ /my_string/) {
# Do something
}
}
The other way would be on shell -
# Untested
grep my_string my_file
if [ $? -eq 1 ]
then
echo Do something
fi
~Parag
On Wed, Mar 2, 2011 at 9:55 AM, Matt lm7...@gmail.com wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
--
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Re: Testing File Contents
On Wed, Mar 2, 2011 at 10:11 AM, Parag Kalra paragka...@gmail.com wrote:
Sorry for the top post. I should have done bottom post. :(
# Untested
use strict;
use warnings;
open my $fh, '', my_file;
while($fh){
if ($_ !~ /my_string/) {
# Do something
}
}
The other way would be on shell -
# Untested
grep my_string my_file
if [ $? -eq 1 ]
then
echo Do something
fi
~Parag
On Wed, Mar 2, 2011 at 9:55 AM, Matt lm7...@gmail.com wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
--
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AW: Testing File Contents
The easiest way in my opinion is to use the 'grep' function like this:
my $searchstring=whatever;
open CFG, '', $_file || die(could not open file: $_file!);
my @data=CFG;
close CFG;
if ( grep /$searchstring/i, @data ) {
print $searchstring found\n;
}
If you negate the grep like this:
@data = grep !/$searchstring/i, @data;
... you can remove the searchstring from your array (file-text).
best regards
Christian
Von: Matt [lm7...@gmail.com]
Gesendet: Mittwoch, 2. März 2011 18:55
Bis: beginners@perl.org
Betreff: Testing File Contents
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
--
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For additional commands, e-mail: beginners-h...@perl.org
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Re: Testing File Contents
# Untested
use strict;
use warnings;
open my $fh, '', my_file;
while($fh){
if ($_ !~ /my_string/) {
# Do something
}
}
This triggers on EVERY line of the file that does not contain the
string. I just want to trigger once if its no where in the file.
The other way would be on shell -
# Untested
grep my_string my_file
if [ $? -eq 1 ]
then
echo Do something
fi
~Parag
On Wed, Mar 2, 2011 at 9:55 AM, Matt lm7...@gmail.com wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
--
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For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
Re: Testing File Contents
The easiest way in my opinion is to use the 'grep' function like this:
my $searchstring=whatever;
open CFG, '', $_file || die(could not open file: $_file!);
my @data=CFG;
close CFG;
if ( grep /$searchstring/i, @data ) {
print $searchstring found\n;
}
This sorta worked. Needed a minor change.
unless ( grep /$searchstring/i, @data ) {
print $searchstring not found\n;
Thanks.
If you negate the grep like this:
@data = grep !/$searchstring/i, @data;
... you can remove the searchstring from your array (file-text).
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
--
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Re: strawberry file end
On Wed, Mar 2, 2011 at 12:02 PM, Christian Henkel p...@henkelchristian.de wrote: In my tutorial they told my to read strings from keyboard (@array = STDIN) and told my to press ctrl+Z for the file end. But pressing ctrl+Z doesn't do anything. Can someone tell my what I have to do to simulate the EOF? Ctrl+D works for ending the file, but the hole script crashes, too. Ctrl+Z works for me in Windows (XP) from the Command Prompt application. Initially pressing Ctrl+Z only adds the character to the line (appearing as ^Z). If I then press enter then it is sent and works. Perhaps the confusion is that the character isn't immediately sent as it is in UNIX-like shells? -- Brandon McCaig http://www.bamccaig.com/ bamcc...@gmail.com V zrna gur orfg jvgu jung V fnl. Vg qbrfa'g nyjnlf fbhaq gung jnl. Castopulence Software http://www.castopulence.org/ bamcc...@castopulence.org -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Testing File Contents
On Wed, 2 Mar 2011, Matt wrote:
The easiest way in my opinion is to use the 'grep' function like this:
my $searchstring=whatever;
open CFG, '', $_file || die(could not open file: $_file!);
my @data=CFG;
close CFG;
if ( grep /$searchstring/i, @data ) {
print $searchstring found\n;
}
This sorta worked. Needed a minor change.
unless ( grep /$searchstring/i, @data ) {
print $searchstring not found\n;
Thanks.
My apologies if I'm beating a dead horse here, but I'm new to Perl and
thought of a slightly different approach:
my $searchrx = qr/whatever/; # or q/whatever/ if you don't need regexp
@ARGV or die qq/you didn't specify a filename\n/;
open FH, q//, shift @ARGV or die qq/file open error: $!/;
$_ = join q//, FH;
close FH;
if ( ! m/$searchrx/s ) {
print qq/pattern not found\n/;
# do something
}
I'm not sure which is more Perlish, but I hear TMTOWTDI is supposed to
be valued, too. I welcome any criticism.
Brian
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RE: Testing File Contents
From: Brian F. Yulga [mailto:byu...@langly.dyndns.org]
On Wed, 2 Mar 2011, Matt wrote:
The easiest way in my opinion is to use the 'grep' function like this:
my $searchstring=whatever;
open CFG, '', $_file || die(could not open file: $_file!); my
@data=CFG; close CFG; if ( grep /$searchstring/i, @data ) {
print $searchstring found\n;
}
This sorta worked. Needed a minor change.
unless ( grep /$searchstring/i, @data ) { print $searchstring not
found\n;
Thanks.
My apologies if I'm beating a dead horse here, but I'm new to Perl and thought
of a slightly different approach:
my $searchrx = qr/whatever/; # or q/whatever/ if you don't need regexp
This is probably personal preference, but I prefer to provide a more
meaningful name rather than using @ARGV. Plus you have lost the filename
once you 'shifted' @ARGV in the open statement. May want to use the file name
in the open error statement or later.
Also, I would not use the '/' as your quote delimiter - that's too recognizable
as
being used as the pattern match delimiter. Use actual double quotes () unless
there are
double quotes in the string - also less typing. Instead of '/' may want to use
'{' and '}'
if using qq (see perldoc perlop, Quote and Quote-like Operators).
my $fileName = shift @ARGV or die You did not specify a filename\n;
@ARGV or die qq/you didn't specify a filename\n/;
Use lexical variable for filehandle. Makes things easier - such as passing to a
function.
open my $FH,'', $fileName or die Error opening $fileName: $!\n;
open FH, q//, shift @ARGV or die qq/file open error: $!/;
The join is unnecessary, set the input_record_separator ($/) to undef or use a
local
copy of $/ (see perldoc perlvar). If this is undefined, the entire file will be
read into
a variable.
$_ = join q//, FH;
close FH;
if ( ! m/$searchrx/s ) {
print qq/pattern not found\n/;
# do something
}
I'm not sure which is more Perlish, but I hear TMTOWTDI is supposed to
be valued, too. I welcome any criticism.
Brian
HTH, Ken
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Re: Testing File Contents
BFY == Brian F Yulga byu...@langly.dyndns.org writes:
BFY My apologies if I'm beating a dead horse here, but I'm new to Perl and
BFY thought of a slightly different approach:
BFY my $searchrx = qr/whatever/; # or q/whatever/ if you don't need regexp
BFY @ARGV or die qq/you didn't specify a filename\n/;
BFY open FH, q//, shift @ARGV or die qq/file open error: $!/;
BFY $_ = join q//, FH;
that is very slow and clunky. perl could slurp the file for you if you
set $/ to undef. or better yet, use File::Slurp to do it
BFY close FH;
BFY if ( ! m/$searchrx/s ) {
why are you using m//? the m isn't needed if you use // for delimiters
the OP wants to know if a file has something or not, not to print each
line.
uri
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Re: Testing File Contents
M == Matt lm7...@gmail.com writes:
M I am looking for a simple way to test if a file does not contain a
M string. This is on a linux box.
M if myfile does not contain mystring {
M #do_something;
M }
M The file is basically a list of names and I want to test that a
M certain name is not in there. Is there an easy way to do that?
2 lines will do it:
use File::Slurp ;
unless( read_file( $file ) =~ /$whatever/ ) {
# do something
}
faster and cleaner than the line by line methods others have posted.
and if you want even more speed, and the file is long, then shell out to
the grep utility and it has an option to only show you if a line
is/isn't in file. i normally don't recommend shelling out but that would
likely be the fastest solution for a large file.
uri
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Re: Testing File Contents
On Wed, Mar 2, 2011 at 3:37 PM, Uri Guttman u...@stemsystems.com wrote:
M == Matt lm7...@gmail.com writes:
2 lines will do it:
use File::Slurp ;
unless( read_file( $file ) =~ /$whatever/ ) {
# do something
}
what's better about File::Slurp than just doing:
my( $file, $string ) = @argv;
open my $fh, '', $file;
while( $fh ) {
print found if /$string/ ;
}
???
How does the function loading works in Perl
Hi, I have this basic question from a long time now, so thought of asking. A Perl script may have many functions. When we execute the script via Perl Interpreter, does all the functions are loaded into memory? Sometimes we just like to keep the coded functions in the script with the idea that we may need them in future. Will removing an un-called functions improve the execution time? ~Parag
Re: How does the function loading works in Perl
2011/3/3 Parag Kalra paragka...@gmail.com: Hi, I have this basic question from a long time now, so thought of asking. A Perl script may have many functions. When we execute the script via Perl Interpreter, does all the functions are loaded into memory? Though there is a stuff called AUTOLOAD, but I think all the functions have been loaded into the memory once the script is run. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Testing File Contents
sw == shawn wilson ag4ve...@gmail.com writes:
sw On Wed, Mar 2, 2011 at 3:37 PM, Uri Guttman u...@stemsystems.com wrote:
M == Matt lm7...@gmail.com writes:
2 lines will do it:
use File::Slurp ;
unless( read_file( $file ) =~ /$whatever/ ) {
# do something
}
what's better about File::Slurp than just doing:
sw my( $file, $string ) = @argv;
sw open my $fh, '', $file;
sw while( $fh ) {
sw print found if /$string/ ;
sw }
less code, much much faster. you loop over each line. my code does one
regex call and stays inside perl for that. inside perl is usually faster
than running perl op. use the benchmark module and look at the
difference. it will be noticeable.
also your code looks at every line whereas my will match the first time
and then quit. that is another optimization. you could do the same if
you exited the loop upon a match.
uri
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Re: How does the function loading works in Perl
On 11-03-02 04:15 PM, Parag Kalra wrote: A Perl script may have many functions. When we execute the script via Perl Interpreter, does all the functions are loaded into memory? All the functions are compiled and loaded. Sometimes we just like to keep the coded functions in the script with the idea that we may need them in future. Will removing an un-called functions improve the execution time? Yes but on modern machines, you will need an awful lot of subs to get a noticeable slow down. The AUTOLOAD feature can be used to delay the compilation and loading of a sub but I have never seen it used in practice. Most modern machines are fast enough so compiling unused subs is not a problem. -- Just my 0.0002 million dollars worth, Shawn Confusion is the first step of understanding. Programming is as much about organization and communication as it is about coding. The secret to great software: Fail early often. Eliminate software piracy: use only FLOSS. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Testing File Contents
On Mar 2, 2011 4:47 PM, Uri Guttman u...@stemsystems.com wrote:
sw == shawn wilson ag4ve...@gmail.com writes:
sw On Wed, Mar 2, 2011 at 3:37 PM, Uri Guttman u...@stemsystems.com
wrote:
M == Matt lm7...@gmail.com writes:
2 lines will do it:
use File::Slurp ;
unless( read_file( $file ) =~ /$whatever/ ) {
# do something
}
what's better about File::Slurp than just doing:
sw my( $file, $string ) = @argv;
sw open my $fh, '', $file;
sw while( $fh ) {
sw print found if /$string/ ;
sw }
less code, much much faster. you loop over each line. my code does one
regex call and stays inside perl for that. inside perl is usually faster
than running perl op. use the benchmark module and look at the
difference. it will be noticeable.
How can I tell or do I figure out if code 'stays inside perl' or not? And,
I'm not exactly sure what you mean by that either?
Beginner of Beginner getting an error
Hi Guys,
I have this script:
#!/usr/bin/perl
# track, find email addresses in emails,
# writes them to /var/opt/ITrootmail/bad/ with a date
# set up as a pipe for procmail or use with Pine
$now = `date`;
# find included email-like addresses
while ($line = STDIN) {
if ($line =~ /\b([\w_\-\.]+ at [\w_\-\.]+)\b/) {
# exclude email addresses not needed
(next) if ( $1 =~ /\d{8,}/ );
(next) if ( $1 =~ /postmaster/i );
(next) if ( $1 =~ /DAEMON/i );
(next) if ( $1 =~ /nobody/i );
(next) if ( $1 =~ /localhost/i );
push( at names,$1);
}
}
close (STDIN);
foreach $idx (0 .. $#names) {
$uniq{$names[$idx]}=1;
}
undef at names;
foreach $item (keys %uniq) {
push ( at names,$item);
}
foreach $address (0 .. $#names) {
open (RECORD, /var/opt/ITrootmail/bad/
$names[$address]);
print (RECORD $now);
close RECORD;
}
I'm getting these two errors:
Type of arg 1 to push must be array (not subroutine entry) at /etc/opt/
ITrootmail/track line 16, near $1)
Type of arg 1 to push must be array (not subroutine entry) at /etc/opt/
ITrootmail/track line 25, near $item)
Any idea?
Thanks
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RE: Testing File Contents
-Original Message-
From: Matt [mailto:lm7...@gmail.com]
Sent: Wednesday, March 02, 2011 11:25
To: beginners@perl.org
Subject: Re: Testing File Contents
# Untested
use strict;
use warnings;
open my $fh, '', my_file;
while($fh){
if ($_ !~ /my_string/) {
# Do something
}
}
This triggers on EVERY line of the file that does not contain the
string. I just want to trigger once if its no where in the file.
Add a simple switch which is set to zero. Then look for the value you
want. When found then you should be able to set to nonzero and leave the while.
Then you should be able to check: if switch is not true, then send the
email...
If you have any questions and/or problems, please let me know.
Thanks.
Wags ;)
David R. Wagner
Senior Programmer Analyst
FedEx Services
1.719.484.2097 Tel
1.719.484.2419 Fax
1.408.623.5963 Cell
http://Fedex.com/us
The other way would be on shell -
# Untested
grep my_string my_file
if [ $? -eq 1 ]
then
echo Do something
fi
~Parag
On Wed, Mar 2, 2011 at 9:55 AM, Matt lm7...@gmail.com wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
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Re: Testing File Contents
sw == shawn wilson ag4ve...@gmail.com writes: less code, much much faster. you loop over each line. my code does one regex call and stays inside perl for that. inside perl is usually faster than running perl op. use the benchmark module and look at the difference. it will be noticeable. sw How can I tell or do I figure out if code 'stays inside perl' or not? And, sw I'm not exactly sure what you mean by that either? a regex will go inside perl's internals and run there. a perl loop as you wrote will execute perl operations. the perl interpreter is slow when executing operations (all perl ops, loop, syntax, etc). but once you get inside an operation it runs fast because the code is in c. uri -- Uri Guttman -- u...@stemsystems.com http://www.sysarch.com -- - Perl Code Review , Architecture, Development, Training, Support -- - Gourmet Hot Cocoa Mix http://bestfriendscocoa.com - -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Beginner of Beginner getting an error
T == TaP 4eversp...@gmail.com writes:
T Hi Guys,
T I have this script:
T #!/usr/bin/perl
T # track, find email addresses in emails,
T # writes them to /var/opt/ITrootmail/bad/ with a date
T # set up as a pipe for procmail or use with Pine
T $now = `date`;
why are you executing a shell command when perl can do that for you with
localtime?
and why is everything indented when you don't have any subs? code should
be at the left if possible and then you indent from there.
T # find included email-like addresses
T while ($line = STDIN) {
T if ($line =~ /\b([\w_\-\.]+ at [\w_\-\.]+)\b/) {
T # exclude email addresses not needed
T (next) if ( $1 =~ /\d{8,}/ );
T (next) if ( $1 =~ /postmaster/i );
T (next) if ( $1 =~ /DAEMON/i );
T (next) if ( $1 =~ /nobody/i );
T (next) if ( $1 =~ /localhost/i );
why are those next's in parens? no need for it. nor are the parens
needed around the conditionals.
T push( at names,$1);
what is 'at'?? did you means @names? i know it should be @names so where
did this code come from with that strange spam hiding @ to at thing?
T }
T }
T close (STDIN);
why close STDIN? no need.
T foreach $idx (0 .. $#names) {
T $uniq{$names[$idx]}=1;
T }
gack, that is bad.
@uniq{ @names } = (1) x @names ;
T undef at names;
again the 'at' names. someone ran this through a stupid address hider
T foreach $item (keys %uniq) {
T push ( at names,$item);
T }
and again.
T foreach $address (0 .. $#names) {
T open (RECORD, /var/opt/ITrootmail/bad/
T $names[$address]);
T print (RECORD $now);
T close RECORD;
T }
T I'm getting these two errors:
T Type of arg 1 to push must be array (not subroutine entry) at /etc/opt/
T ITrootmail/track line 16, near $1)
T Type of arg 1 to push must be array (not subroutine entry) at /etc/opt/
T ITrootmail/track line 25, near $item)
T Any idea?
plenty. you didn't write this code. you should learn perl and not use
code from places if you don't understand it. otherwise you will always
be asking for help and can't do the work yourself.
uri
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Re: Testing File Contents
On 02/03/2011 17:55, Matt wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
Hey Matt
If your file is small then this subroutine will do what you need.
sub file_contains {
my $file, $string = @_;
open $file, '', $file or die $!;
my %names = map { chomp; ($_ = 1) } DATA;
return $names{$string};
}
HTH,
Rob
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Re: Testing File Contents
RD == Rob Dixon rob.di...@gmx.com writes:
RD On 02/03/2011 17:55, Matt wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
RD Hey Matt
RD If your file is small then this subroutine will do what you need.
RD sub file_contains {
RD my $file, $string = @_;
you forgot the () around the my vars.
that will assign the count of @_ to $file. not what you want.
perl -le '@foo = qw( a b ) ;my $x, $y = @foo ; print $x $y'
2
RD open $file, '', $file or die $!;
RD my %names = map { chomp; ($_ = 1) } DATA;
don't you mean $file there?
RD return $names{$string};
RD }
uri
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Re: Testing File Contents
On 02/03/2011 23:56, Uri Guttman wrote:
RD == Rob Dixonrob.di...@gmx.com writes:
RD On 02/03/2011 17:55, Matt wrote:
I am looking for a simple way to test if a file does not contain a
string. This is on a linux box.
if myfile does not contain mystring {
#do_something;
}
The file is basically a list of names and I want to test that a
certain name is not in there. Is there an easy way to do that?
RD Hey Matt
RD If your file is small then this subroutine will do what you need.
RDsub file_contains {
RD my $file, $string = @_;
you forgot the () around the my vars.
that will assign the count of @_ to $file. not what you want.
perl -le '@foo = qw( a b ) ;my $x, $y = @foo ; print $x $y'
2
RD open $file, '', $file or die $!;
RD my %names = map { chomp; ($_ = 1) }DATA;
don't you mean$file there?
RD return $names{$string};
RD}
Thanks Uri. It's midnight and I should be in bed :-/
Version 2:
sub file_contains {
my ($file, $string) = @_;
open my $fh, '', $file or die $!;
my %names = map { chomp; ($_ = 1) } $fh;
return $names{$string};
}
Rob
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Re: Testing File Contents
RD == Rob Dixon rob.di...@gmx.com writes:
RD Thanks Uri. It's midnight and I should be in bed :-/
we should all be in bed!
RD Version 2:
RD sub file_contains {
RD my ($file, $string) = @_;
RD open my $fh, '', $file or die $!;
RD my %names = map { chomp; ($_ = 1) } $fh;
RD return $names{$string};
RD }
did you see my fast slurp version in this thread?
uri
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Re: Beginner of Beginner getting an error
On 3/2/11 Wed Mar 2, 2011 3:33 PM, Uri Guttman u...@stemsystems.com
scribbled:
T == TaP 4eversp...@gmail.com writes:
T Hi Guys,
T I have this script:
T if ($line =~ /\b([\w_\-\.]+ at [\w_\-\.]+)\b/) {
The ' at ' in the above line should also be '@'.
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Re: Testing File Contents
Ken Slater wrote:
From: Brian F. Yulga [mailto:byu...@langly.dyndns.org]
On Wed, 2 Mar 2011, Matt wrote:
The easiest way in my opinion is to use the 'grep' function like
this:
my $searchstring=whatever; open CFG, '', $_file || die(could
not open file: $_file!); my @data=CFG; close CFG; if ( grep
/$searchstring/i, @data ) { print $searchstring found\n; }
This sorta worked. Needed a minor change.
unless ( grep /$searchstring/i, @data ) { print $searchstring
not found\n;
Thanks.
My apologies if I'm beating a dead horse here, but I'm new to Perl
and thought of a slightly different approach:
my $searchrx = qr/whatever/; # or q/whatever/ if you don't need
regexp
This is probably personal preference, but I prefer to provide a more
meaningful name rather than using @ARGV. Plus you have lost the
filename once you 'shifted' @ARGV in the open statement. May want to
use the file name in the open error statement or later.
I agree with you, saving the filename to a variable is probably a better
practice, in general. In this context it wasn't specified that it was
needed later, so I opted to just 'shift' it to use once.
Also, I would not use the '/' as your quote delimiter - that's too
recognizable as being used as the pattern match delimiter. Use actual
double quotes () unless there are double quotes in the string - also
less typing. Instead of '/' may want to use '{' and '}' if using qq
(see perldoc perlop, Quote and Quote-like Operators).
Good point. I started using generic quotes almost exclusively when I
discovered that they avoided some of the possible shell-interpolation
issues that arise when executing perl one-liners. I've probably taken
it too far. I can see that '/' is not a great idea. Besides '{' and
'}' as quote delimiters, do you think it's generally tolerated to use
'(', ')', '[', ']' ?
my $fileName = shift @ARGV or die You did not specify a
filename\n;
@ARGV or die qq/you didn't specify a filename\n/;
Use lexical variable for filehandle. Makes things easier - such as
passing to a function.
open my $FH,'', $fileName or die Error opening $fileName: $!\n;
open FH, q//, shift @ARGV or die qq/file open error: $!/;
Okay, I'll work on breaking that habit. My first lessons in Perl used
the open FH convention, and I just got used to it.
The join is unnecessary, set the input_record_separator ($/) to undef
or use a local copy of $/ (see perldoc perlvar). If this is
undefined, the entire file will be read into a variable.
Oh, I totally forgot about the input_record_separator ( $/ )...
That's WAY better (actually when I wrote the 'join', I was thinking that
I shouldn't need to do it that way!)
Thanks much for the suggestions,
Brian
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Re: Testing File Contents
Uri Guttman wrote:
BFY == Brian F Yulga byu...@langly.dyndns.org writes:
BFY My apologies if I'm beating a dead horse here, but I'm new to
Perl and BFY thought of a slightly different approach:
BFY my $searchrx = qr/whatever/; # or q/whatever/ if you don't need
regexp BFY @ARGV or die qq/you didn't specify a filename\n/; BFY
open FH, q//, shift @ARGV or die qq/file open error: $!/; BFY $_ =
join q//, FH;
that is very slow and clunky. perl could slurp the file for you if
you set $/ to undef. or better yet, use File::Slurp to do it
Yes, definitely better to set $/ to undef.
I'm still trying to get a handle on the libraries at my disposal --
There's so much in CPAN it's hard to know where to start. Is it
equivalently efficient to use IO::All or IO::Simple, or is File::Slurp
truly the best for this purpose?
I ask because I played with IO:All to read files, enjoyed the simple,
intuitive syntax my $filecontents io('filename'); , but (perhaps
naively) assumed the native open my $fh to be faster since it doesn't
require a use to load a library.
BFY close FH; BFY if ( ! m/$searchrx/s ) {
why are you using m//? the m isn't needed if you use // for
delimiters
Yeah, I know, I don't need it... being verbose (sometimes) keeps a
newbie like me from making silly mistakes :-)
My initial experimentation with Perl has been mostly in a line-by-line
mind-set because I have a tendency to write scripts that are used like:
some-unix-command | perl -wne 'do some processing' myresults.txt
I'm trying to expand my horizons, thanks for help,
Brian
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Re: Beginner of Beginner getting an error
JG == Jim Gibson jimsgib...@gmail.com writes:
JG On 3/2/11 Wed Mar 2, 2011 3:33 PM, Uri Guttman u...@stemsystems.com
JG scribbled:
T == TaP 4eversp...@gmail.com writes:
T Hi Guys,
T I have this script:
T if ($line =~ /\b([\w_\-\.]+ at [\w_\-\.]+)\b/) {
JG The ' at ' in the above line should also be '@'.
my eyeballs missed that one. very odd hiding harmless @'s from
spammers. never seen perl code like that before.
uri
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Re: How does the function loading works in Perl
On Wed, 02 Mar 2011 17:02:30 -0500, Shawn H Corey wrote: On 11-03-02 04:15 PM, Parag Kalra wrote: A Perl script may have many functions. When we execute the script via Perl Interpreter, does all the functions are loaded into memory? All the functions are compiled and loaded. Sometimes we just like to keep the coded functions in the script with the idea that we may need them in future. Will removing an un-called functions improve the execution time? Yes but on modern machines, you will need an awful lot of subs to get a noticeable slow down. Right. The AUTOLOAD feature can be used to delay the compilation and loading of a sub I think you mean AutoLoader. Or SelfLoader. They may use AUTOLOAD under the hood but that's not the direction to point the user in. but I have never seen it used in practice. There are a fair number of modules on CPAN using it. And in the core: POSIX, for instance. -- Peter Scott http://www.perlmedic.com/ http://www.perldebugged.com/ http://www.informit.com/store/product.aspx?isbn=0137001274 http://www.oreillyschool.com/courses/perl3/ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
