RE: Query in Perl Programming
Thanks Gunnar for the suggestions. In which version of perl is Parse module available. We have perl version 5.8.0 and parse module is not available. Rajini -Original Message- From: Gunnar Hjalmarsson [mailto:nore...@gunnar.cc] Sent: Tuesday, January 27, 2009 7:42 PM To: beginners@perl.org Subject: Re: Query in Perl Programming S, Rajini (STSD) wrote: Hi, I am new to Perl Programming and have a query in perl. In perl is there any system defined functions to find out the Differences in dates. Eg : Date 1 - 26-Jan-2009 Date 2 - 14-Jan-2009 So the difference between two dates is 12 days. Is there a way to achieve this with any system defined functions In Perl It depends on what you mean by system defined functions. As others have told you, there are many CPAN modules that deal with date and time related tasks. Your particular problem can be easily solved using only a module that is included in the standard Perl distribution. use Date::Parse; my $time1 = str2time '26-Jan-2009'; my $time2 = str2time '14-Jan-2009'; print 'Difference: ', sprintf( '%.0f', ($time1-$time2)/86400 ), days\n; -- Gunnar Hjalmarsson Email: http://www.gunnar.cc/cgi-bin/contact.pl -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Query in Perl Programming
S, Rajini (STSD) wrote:
From: Gunnar Hjalmarsson [mailto:nore...@gunnar.cc]
S, Rajini (STSD) wrote:
I am new to Perl Programming and have a query in perl.
In perl is there any system defined functions to find out the
Differences in dates.
Eg :
Date 1 - 26-Jan-2009
Date 2 - 14-Jan-2009
So the difference between two dates is 12 days.
Is there a way to achieve this with any system defined functions In
Perl
It depends on what you mean by system defined functions. As
others have told you, there are many CPAN modules that deal
with date and time related tasks. Your particular problem can
be easily solved using only a module that is included in the
standard Perl distribution.
use Date::Parse;
my $time1 = str2time '26-Jan-2009';
my $time2 = str2time '14-Jan-2009';
print 'Difference: ',
sprintf( '%.0f', ($time1-$time2)/86400 ), days\n;
Thanks Gunnar for the suggestions.
In which version of perl is Parse module available.
We have perl version 5.8.0 and parse module is not available.
(Please bottom-post your responses to this group. Thank you.)
As far as I know Gunnar is mistaken and Date::Parse is not a standard module in
any version of Perl. However Time::Local is, and you may be interested in the
solution below that uses it. If your dates aren't guaranteed to be well-formed
then you may want to do some checking on them before you call the epoch_days
function.
HTH,
Rob
use strict;
use warnings;
use Time::Local;
my $days1 = epoch_days('26-Jan-2009');
my $days2 = epoch_days('14-Jan-2009');
print Difference: @{[$days1 - $days2]} days\n;
BEGIN {
my %month_num = do {
my $n = 1;
map(($_, $n++), qw/jan feb mar apr may jun jul aug sep oct nov dec/);
};
sub epoch_days {
my @dmy = split /-/, shift;
$dmy[1] = $month_num{lc $dmy[1]} || 0;
return timelocal(0, 0, 0, @dmy) / (24 * 60 * 60);
}
}
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Re: removing an arbitrary element from array
On Sun, Dec 7, 2008 at 2:01 AM, Rob Dixon rob.di...@gmx.com wrote:
Sharan Basappa wrote:
I was wondering if there is a quick way to remove an arbitrary element
from an array.
I have an array which stores _ delimited strings a_b_c_1). The last
string stores the rank of the string.
I have to remove a string from array that has the lowest number.
e.g. a_b_c_1, a_b_c_2. In this case, a_b_c_2 should be removed. The
strings are not arranged in any
specific order in the array.
I'm hoping you've made a mistake, because if I understand you correctly then
out
of ('a_b_c_1', 'a_b_c_2') the first should be removed because 1 is less than
two.
If I'm right then the program below should be useful.
HTH,
Rob
use strict;
use warnings;
my @data = qw/
a_b_c_99
a_b_c_6
a_b_c_1
a_b_c_2
a_b_c_22
/;
my ($idx, $min_seq);
foreach (0 .. $#data) {
my ($seq) = $data[$_] =~ /(\d+)$/;
next if defined $idx and $seq $min_seq;
($idx, $min_seq) = ($_, $seq);
}
splice @data, $idx, 1;
Hi Rob,
I have a question on this. I realized that I also need to save the
element that I am removing from
the array. Would this code work (should remove the element and save it
in the variable)
$removed_element = splice @data, $idx, 1
Regards
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Re: removing an arbitrary element from array
Sharan Basappa wrote:
On Sun, Dec 7, 2008 at 2:01 AM, Rob Dixon rob.di...@gmx.com wrote:
I'm hoping you've made a mistake, because if I understand you correctly then
out
of ('a_b_c_1', 'a_b_c_2') the first should be removed because 1 is less than
two.
If I'm right then the program below should be useful.
use strict;
use warnings;
my @data = qw/
a_b_c_99
a_b_c_6
a_b_c_1
a_b_c_2
a_b_c_22
/;
my ($idx, $min_seq);
foreach (0 .. $#data) {
my ($seq) = $data[$_] =~ /(\d+)$/;
next if defined $idx and $seq $min_seq;
($idx, $min_seq) = ($_, $seq);
}
splice @data, $idx, 1;
I have a question on this. I realized that I also need to save the element
that I am removing from the array. Would this code work (should remove the
element and save it in the variable)
$removed_element = splice @data, $idx, 1
Exactly right. Yes.
Rob
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Re: removing an arbitrary element from array
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Re: Query in Perl Programming
Rob Dixon wrote: S, Rajini (STSD) wrote: From: Gunnar Hjalmarsson [mailto:nore...@gunnar.cc] Your particular problem can be easily solved using only a module that is included in the standard Perl distribution. use Date::Parse; my $time1 = str2time '26-Jan-2009'; my $time2 = str2time '14-Jan-2009'; print 'Difference: ', sprintf( '%.0f', ($time1-$time2)/86400 ), days\n; Thanks Gunnar for the suggestions. In which version of perl is Parse module available. We have perl version 5.8.0 and parse module is not available. (Please bottom-post your responses to this group. Thank you.) As far as I know Gunnar is mistaken and Date::Parse is not a standard module in any version of Perl. Obviously I am; Sorry about that. (It happened to be included in both the distributions I am currently working with.) Still easy to install, of course. ;-) -- Gunnar Hjalmarsson Email: http://www.gunnar.cc/cgi-bin/contact.pl -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Help with modules and objects
On Jan 26, 1:36 pm, wpflu...@yahoo.com (Bill) wrote: I'm not a beginner with perl but all of my previous stuff has been simple and I've never really used modules, until now. I'm working on a program that has to receive a mime encoded email and pull info out of it. I'm using Email::Simple and Email:MIME and I can read the emails fine but I'm having problems accessing the 'parts' of the email without just dumping the entire message to a raw format in a variable and string searching it for what I want. My problem is that I'm not sure how to 'use' the data objects returned by the module. My example is that I get a message in using NET::POP3 and make it into a string using join and then I pass the string into Email::MIME and make a new object?? out of it I can check the subject of the main message using -header_pairs and then pulling the subject out of the list it makes but there is a seconday subject because the emails I'm working on will be returned emails meaning they failed in getting through somehow and I need to pull the original subject line to find out some info. I tried using -parts on it but here is where I'm stuck as I don't understand how to handle what I get back. The docs say that parts pass back, and I quote: This returns a list of Email::MIME objects reflecting the parts of the message. I'm just not sure how I go about pulling the info out of the three hash?? references?? I'm getting back. Can anyone point me in the right direction? Thanks Well I kinda figured out this part on my own, just had to feed back the object through Email::MIME and got what I needed. I need help on another email problem but I'll start a new post for that. Bill -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: What does MakeFile do?
Which is obviously a real beginner question. I have googled around, but all the info I have found assumes you have access to the server. My sites are shared hosting accounts located at Earthlink, Verio, GoDaddy, etc. I have used a number of scripts which I can use just by ftp uploading text files and changing permissions. Now I have a script (a module actually) I would like to use which arrives as a package that needs to be installed with a MakeFile.PL First, how can I install this module? Well, I just copied the .pm files up to folders on the remote server and changed permissions. Before I had the folder organization wrong. In the calling file I used use lib '.'; to get the dependencies. So my question still stands: What does MakeFile do that just copying the .pm files doesn't? Thanks for your help. -- Lewis Kirk www.dmzgraphics.com 803-787-3450 -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: What does MakeFile do?
Which is obviously a real beginner question. I have googled around, but all the info I have found assumes you have access to the server. My sites are shared hosting accounts located at Earthlink, Verio, GoDaddy, etc. I have used a number of scripts which I can use just by ftp uploading text files and changing permissions. Now I have a script (a module actually) I would like to use which arrives as a package that needs to be installed with a MakeFile.PL First, how can I install this module? Well, I just copied the .pm files up to folders on the remote server and changed permissions. Before I had the folder organization wrong. In the calling file I used use lib '.'; to get the dependencies. So my question still stands: What does MakeFile do that just copying the .pm files doesn't? As I stated earlier, if the module is architecture dependent the make builds against the architecture. Also, you get the documentation with make, guess you cant do a 'perldoc module' with your installation. Of course, that may not matter Owen -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
perl stdout errors due to called script does not exist
for the example perl script below is there a way to avoid errors from showing up in stdout if the shell script being called does not exist? The shell script being called is not in the same directory as the perl script, but is in the path. Otherwise I would just do a check to see if it exist before calling it. redirecting the output to /dev/null doesn't seem to work. #!/usr/bin/perl `sm_timeline.sh $0 socket usage 2/dev/null`; print hello\n; -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: perl stdout errors due to called script does not exist
Hi, inetquestion wrote: for the example perl script below is there a way to avoid errors from showing up in stdout if the shell script being called does not exist? The shell script being called is not in the same directory as the perl script, but is in the path. Otherwise I would just do a check to see if it exist before calling it. redirecting the output to /dev/null doesn't seem to work. #!/usr/bin/perl `sm_timeline.sh $0 socket usage 2/dev/null`; print hello\n; So, if you want to check to see if the file exists, then you just use the appropriate file test from here: http://perldoc.perl.org/functions/-X.html If you want to redirect stdout to /dev/null, then you will need: 1/dev/null. 2 is stderr. If you want both going to /dev/null, then: 1/dev/null 21 would send stderr to the same place you sent stdout. Was this what you were looking for? Ray -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
system(cd /home/tomer/temp) problem
after exectue the command system(cd /home/tomer/temp) I dont see the terminal change the direcotry? maybe the change is valid only in the script? how can i control seeing terminal direcotry with perl script ? Thanks Tomer -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: system(cd /home/tomer/temp) problem
Hi Tomer, tomer wrote: after exectue the command system(cd /home/tomer/temp) I dont see the terminal change the direcotry? maybe the change is valid only in the script? how can i control seeing terminal direcotry with perl script ? system might not be what you want. What it does is that it creates a new process in which to run your command (see http://perldoc.perl.org/functions/system.html); so that is one reason why you can't see the change. If you want to change the directory, use perl's built-in function chdir: http://perldoc.perl.org/functions/chdir.html I think that is what you are looking for. Ray -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
very basic questions
i am completely new to perl, can you explain to me the following line of
code in red.
how does this line of code grab a time value and assign it to $ time,
how does assigment happend in this conditiona statement.
while ()
{
chop;
# Grab the time
next unless ($time) = /(\d+:\d+:\d+\,\d+)/;
Re: very basic questions
i am completely new to perl, can you explain to me the following line
of
code in red.
how does this line of code grab a time value and assign it to $ time,
how does assigment happend in this conditiona statement.
while ()
{
chop;
# Grab the time
next unless ($time) = /(\d+:\d+:\d+\,\d+)/;
I don't see any line in red :-(
I presume time is written in a format such as :MM:DD,HH ( eg
2009:01:29,15 )
/(\d+:\d+:\d+\,\d+)/ is therefore the regular expression that looks
for digits separated by colons and finally a comma
\d+: is any number of digits followed by a :
/(\d+:\d+:\d+\,\d+)/ will match 2009:01:29,15 but not 2009:01:29:15
Once a match is made, an assignment is made, otherwise $time would be
undefined or the value of the last match
Owen
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Re: very basic questions
b chen wrote:
i am completely new to perl, can you explain to me the following line of
code in red.
There is no red here, there is only black and white.
how does this line of code grab a time value and assign it to $ time,
how does assigment happend in this conditiona statement.
while ()
{
chop;
Better to use chomp instead of chop.
# Grab the time
next unless ($time) = /(\d+:\d+:\d+\,\d+)/;
The capturing parentheses in the regular expression return their
contents in list context and the parentheses around the variable $time
define a list context with a single lvalue.
John
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annoyance to those of us who do.-- Isaac Asimov
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how to copy elements into the next array
Hi,
How do I copy the first 10 elements of @a into @b?
The method that I use is long :-
my @a = 1..20;
my @b = ();
my $ctr = 0;
foreach (@a){
if ($ctr 10){
push @b,$_;
}
$ctr ++;
}
Thanks.
回复:how to copy elements into the next array
try this,
@b[0..9] = @a[0..9];
- 原邮件 -
从: itshardtogetone itshardtoget...@hotmail.com
日期: 星期四, 一月 29日, 2009 下午2:39
主题: how to copy elements into the next array
Hi,
How do I copy the first 10 elements of @a into @b?
The method that I use is long :-
my @a = 1..20;
my @b = ();
my $ctr = 0;
foreach (@a){
if ($ctr 10){
push @b,$_;
}
$ctr ++;
}
Thanks.
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Re: how to copy elements into the next array
itshardtogetone wrote: Hi, Hello, How do I copy the first 10 elements of @a into @b? my @b = @a[ 0 .. 9 ]; John -- Those people who think they know everything are a great annoyance to those of us who do.-- Isaac Asimov -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
RE: Is there a way to un-install modules?
Hi, There is no tool available to uninstall modules. However what you can do manually is this. I use Active Perl 5.10 on Windows. 1. Open the .packlist file in Perl/lib directory in any text editor. This contains the path of all modules installed on your system (along with some other entries as well). 2. Search module u want to remove in that file. (You will get the exact path of all files related to the module). 3. Take the backup of all those files. 4. Navigate to the paths remove files manually. 5. Check whether perl is working fine or not. 6. Remove the entry from .packlist You can do the same with file equivalent to '.packlist' on 'LINUX' or 'UNIX'. Hope this helps. Thanks Sanket Vaidya -Original Message- From: Randal L. Schwartz [mailto:mer...@stonehenge.com] Sent: Sunday, January 25, 2009 9:56 AM To: beginners@perl.org Subject: Re: Is there a way to un-install modules? Bruce == Bruce Ferrell bferr...@baywinds.org writes: Bruce I know this is going to sound odd, but I've installed some Bruce modules using the CPAN module and I now want to uninstall them or Bruce put them into a state where they are no longer detected. Is there a way to do this? The key thing to remember is that CPAN and CPANPLUS are installers, not packagers. As such, they do not ensure that a file that they are installing belongs exclusively to the thing being installed. Thus, if you blindly remove everything that had been installed during a particular run, you could end up with a broken system. -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 mer...@stonehenge.com URL:http://www.stonehenge.com/merlyn/ Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc. See http://methodsandmessages.vox.com/ for Smalltalk and Seaside discussion -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/ _ This e-mail message may contain proprietary, confidential or legally privileged information for the sole use of the person or entity to whom this message was originally addressed. Any review, e-transmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this e-mail in error kindly delete this e-mail from your records. If it appears that this mail has been forwarded to you without proper authority, please notify us immediately at netad...@patni.com and delete this mail. _ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
