online perl courses
Can anyone please recommend intermediate to advance perl online courses/tutorials with focus on Object oriented techniques, if they know. I am willing to pay also if it costs something. Thanks, -Ben
Re: data dumper
Thanks everyone, I tried the module and it is great. Thanks, -Ben On Mon, May 17, 2010 at 8:00 AM, Shawn H Corey shawnhco...@gmail.comwrote: On 10-05-17 10:35 AM, Eric Veith1 wrote: Bob McConnellr...@cbord.com wrote on 05/17/2010 02:26:58 PM: What is the difference between this and exporting a YAML file? Where would either be preferred over the other? Except for the obvious syntax and that YAML might be easier to read for end users that just happen to edit a config file, I guess there's none. AFAIK, YML has a notation for references (i.e., let one node of the document refer to another), too. So it all depends on the parser. I'm not sure whether evaluating perl code would be fast than parsing YML, but for a config file, I guess it wouldn't make much of a difference. Unless the parser is really slow, it shouldn't matter since this is a one time event. The thing about using Data::Dumper to store the configuration is that it is in Perl. You don't have to learn a second syntax to use it. You can change it directly by using a text editor. The reason you have a save_config subroutine is so the end user can change the configuration by interacting with the script. You, the great Perl programmer, don't need it; you can change it directly in its file. :) -- Just my 0.0002 million dollars worth, Shawn Programming is as much about organization and communication as it is about coding. I like Perl; it's the only language where you can bless your thingy. 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/
data dumper
What is the use of Data::Dumper module? can any body please give examples? Have been using perl for some time and never used this module. Not sure if i am missing something by not using it. Thanks, -Ben
running stats on a file
Hi Everyone, I writing this program to check if a file is being touched (linux touch command) every 25 seconds.I am using stat command on linux. For example(please check the bold), stat file File: `file' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 803h/2051d Inode: 164394 Links: 1 Access: (0666/-rw-rw-rw-) Uid: (0/ admin) Gid: (0/root) Access: 2010-03-16 12:09:03.0 -0700 Modify: 2010-03-16 12:09:03.0 -0700 Change: *2010-03-16 *12:09:03.0 -0700 = After 25 seconds: [ad...@machine ~]# stat file File: `file' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 803h/2051d Inode: 164394 Links: 1 Access: (0666/-rw-rw-rw-) Uid: (0/ admin) Gid: (0/root) Access: 2010-03-16 12:09:28.0 -0700 Modify: 2010-03-16 12:09:28.0 -0700 Change: *2010-03-16* 12:09:28.0 -0700 = I am just worried about the change attribute above from stat command. So , what i am trying to do convert 12:09:03(as in the example above) into seconds and add 25 seconds and convert back into hour:minutes:seconds format and check the values match. Hope it is clear. Thanks for the help in advance, -Ben
Re: running stats on a file
Hi Jim, Thanks for the reply. This seem to work only if i am running perl on the machine itself. I am instead using expect to ssh into this machine and run stat command and use the output from that command to check the output of that stat command. Thanks, -Ben On Tue, Mar 16, 2010 at 1:31 PM, Jim Gibson jimsgib...@gmail.com wrote: On 3/16/10 Tue Mar 16, 2010 12:18 PM, ben perl ben.pe...@gmail.com scribbled: Hi Everyone, I writing this program to check if a file is being touched (linux touch command) every 25 seconds.I am using stat command on linux. For example(please check the bold), stat file File: `file' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: 803h/2051d Inode: 164394 Links: 1 Access: (0666/-rw-rw-rw-) Uid: (0/ admin) Gid: (0/root) Access: 2010-03-16 12:09:03.0 -0700 Modify: 2010-03-16 12:09:03.0 -0700 Change: *2010-03-16 *12:09:03.0 -0700 = I am just worried about the change attribute above from stat command. So , what i am trying to do convert 12:09:03(as in the example above) into seconds and add 25 seconds and convert back into hour:minutes:seconds format and check the values match. If you are writing a Perl program, you can use the Perl built-in stat function that returns 'last modify time' in seconds from the epoch (1/1/70:00:00:00 UTC), rather than the Linux stat command as above. That way, you can easily compare times numerically and not worry about converting between numerical and string forms. See 'perldoc -f stat' for details. There is also the -M file test operator that returns the age (difference between the time your program started and the time the file was modified) of any file in floating-point days (multiply by 86,400 to get age in seconds). See 'perldoc -f -X' for details. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: running stats on a file
Thanks Jim, Date::Parse worked. -Ben On Tue, Mar 16, 2010 at 2:32 PM, Jim Gibson jimsgib...@gmail.com wrote: On 3/16/10 Tue Mar 16, 2010 2:05 PM, ben perl ben.pe...@gmail.com scribbled: Hi Jim, Thanks for the reply. This seem to work only if i am running perl on the machine itself. I am instead using expect to ssh into this machine and run stat command and use the output from that command to check the output of that stat command. Then check out the various date/time modules included with Perl or available on CPAN, including Time::localtime, Time::Local, Date::Calc, DateTime, and Date::Manip. Date::Manip in particular has the ParseDate function for return a numerical time given a string. You can also do your own parsing of the output of stat, extracting the date and time fields and using the timelocal or timegm functions of the Time::Local module to calculate Unix times. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
perl script to log on to website
Is there a way i can use perl to log on to my cell phone provider website and download the minutes i have used and email me if i am going over certain minutes? Thanks, -Ben
Re: explanation of @INC
Thanks Everyone,
This does help..
-Bandeep
On Fri, Jan 23, 2009 at 9:48 AM, Gunnar Hjalmarsson nore...@gunnar.ccwrote:
Scott Haneda wrote:
On Jan 23, 2009, at 1:01 AM, Gunnar Hjalmarsson wrote:
Scott Haneda wrote:
ASSP required about 15 perl modules, I installed them, or wrote new
portfiles for them to get them installed. I have all requirements for ASSP
installed. I edit the ASSP source files to change the first line from:
#!/usr/bin/perl --
to
#!/opt/local/bin/perl --
When I run ASSP, it tells me three ports are not installed. One is
Email::Valid, which should serve well enough as a way for me to learn how
to
solve this.
Try running:
/usr/bin/perl -MEmail::Valid -e 'print $INC{Email/Valid.pm}'
$/usr/bin/perl -MEmail::Valid -e 'print $INC{Email/Valid.pm}'
Can't locate Email/Valid.pm in @INC (@INC contains:
/System/Library/Perl/5.8.8/darwin-thread-multi-2level
/System/Library/Perl/5.8.8 /Library/Perl/5.8.8/darwin-thread-multi-2level
/Library/Perl/5.8.8 /Library/Perl
/Network/Library/Perl/5.8.8/darwin-thread-multi-2level
/Network/Library/Perl/5.8.8 /Network/Library/Perl
/System/Library/Perl/Extras/5.8.8/darwin-thread-multi-2level
/System/Library/Perl/Extras/5.8.8 /Library/Perl/5.8.6 /Library/Perl/5.8.1
.).
BEGIN failed--compilation aborted.
and
/opt/local/bin/perl -MEmail::Valid -e 'print $INC{Email/Valid.pm}'
$/opt/local/bin/perl -MEmail::Valid -e 'print $INC{Email/Valid.pm}'
/opt/local/lib/perl5/vendor_perl/5.8.9/Email/Valid.pm
and let us know the results.
I am not entirely sure what that all means, but I think it is telling me
there is in fact no Email::Valid in the default install, but there is one in
the /opt/local/bin/perl one.
Yes, and that indicates that ASSP is still running the default Perl
install, even if you told us that you edited the shebang line of the ASSP
source files. Maybe you missed some file(s), maybe the command that invokes
ASSP does not rely on the shebang line(s) to determine which of the Perl
installs to use.
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/
use vs require
Hi Everyone, I am could never understand the difference between use vs require? If require is older way of including modules, why not just make it obsolete. Thanks, -Bandeep
Re: use vs require
Hi Chas,
Can you give me an example when one would be used over the other? So, is
require used more for efficiency, so we load the module only if we need it?
Thanks,
-Ben
On Thu, Jan 22, 2009 at 2:50 PM, Chas. Owens chas.ow...@gmail.com wrote:
On Thu, Jan 22, 2009 at 17:33, ben perl ben.pe...@gmail.com wrote:
Hi Everyone,
I am could never understand the difference between use vs require? If
require is older way of including modules, why not just make it
obsolete.
snip
Well, first off, because use uses require. The use looks something
like this internally
BEGIN {
require Module;
import Module args_to_use;
}
There is also a difference in when they run. Because of the BEGIN
block, use statements occur at compile time, so it is not possible to
conditionally load a module (without eval). The require function runs
at runtime, so you can say things like
if ($use_module_foo) {
require Module::Foo;
import Module::Foo;
}
--
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.
disk performance or destructive testing
Does anyone know any perl module for validating or do some desctructive testing on disks on Linux platform? Thanks, -Ben
trying to put in an array patters matched.
Hi I am trying to push values in array to what ever matched in a regular expression. For example $string = something22 322 abc; $string =~ /(\d+)\s(\d+)(abc)/; This should create an array like with elements as (22, 322,abc). What will the best way to do it? The regular expression is really long as compared to the one i am mentioning and was wondering if could create a loop which would iterate over $1,$2,$3 .$15 (temporary variable which perl uses to store patterns matched) and store those in an array. Thanks, -Ben
Re: perl cumulative module question
Thanks Everyone!! This should help. On Sat, Nov 22, 2008 at 9:17 AM, Rob Dixon [EMAIL PROTECTED] wrote: Rob Dixon wrote: Your arithmetic is odd. You say 9-4 = 2 and so your resulting list should be (2,4,2). If you want to subtract the previous result from the next item in your data list each time then this will do the job. HTH, Rob use strict; use warnings; my @data = (2, 6, 9); my @delta = @data; my $prev = 0; $prev = $_ = $_-$prev for @delta; print @delta\n; **OUTPUT** 2 4 5 Jay's solution is very similar but preferable to mine. Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
perl cumulative module question
Is there a perl module to find cumulative in a column? It should subtract from the previous row and creates new column. For example, If i have the follow column in my file 2 6 9 It gives me 2 6-2 = 4 9-4 = 2 So the resulting column is 2 4 2 Hope I am using cumulative as the right word to explain this. I could write my own script but did not want to reinvent the wheel. Thanks, -Bandeep
perl module for graphs lines point
Hi , Is there a perl module to plot graphs with lines point. Thanks, -Bandeep
