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Operating Systems Linux crontab and perl
# 1  
Old 02-11-2010
crontab and perl
Hi ,
I don't understanding why my perl script is not executing through crontab .
but it runs properly if we run it at command prompt by typing "perl $path_of_script".
I found that cron daemon reads the line "perl $path_of_script" as command at proper timing defined in crontab and logs it in /var/log/cron.
But it is not executing.
I think it may be issue of environmental variables for cron daemon.
How to debug this issue ?
Thanks for help in advance.
# 2  
Old 02-11-2010
Export the .profile..

Ex:

Code:
30 * * * * (/home/user1/.profile ; perl /path/of/perlscript.pl)

# 3  
Old 02-11-2010
Hi,
I just check with above suggestion but it is not working.
I else tried with include

Code:
20 * * * * "source /home/user1/.bash_profile;perl $perl_script_path"

it is also not working
Then I write temp.sh file as

Code:
#/bin/bash
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi
PATH=$PATH:$HOME/bin
export PATH

perl path_of_perl_file.pl

in one shell script and include it in crontab as
Code:
20 * * * *  /home/user1/temp.sh


but also not working .
can any body stress out !
Last edited by pludi; 02-11-2010 at 04:53 AM.. Reason: code tags, please...
# 4  
Old 02-11-2010
Quote:
Originally Posted by sandeepvson
Hi,
I just check with above suggestion but it is not working.
I else tried with include

Code:
20 * * * * "source /home/user1/.bash_profile;perl $perl_script_path"

it is also not working
That will never work since if you type "source /home/user1/.bash_profile;perl $perl_script_path" into a shell surrounded in quotes like that it won't work. It's the same syntax.

Try calling perl with an absolute path.
# 5  
Old 02-12-2010
I put line in my crontab as

Code:
50 09 * * *  (/root/.bash_profile;/usr/bin/perl /home/perl/env.pl)

Code:
& /var/log/cron    log file is as

Feb 12 09:50:01 localhost crond[6192]: (root) RELOAD (cron/root)
Feb 12 09:50:01 localhost CROND[26275]: (root) CMD (/root/.bash_profile;/usr/bin/perl /home/perl/env.pl)

It is reading declaration but not able to execute with cron daemon.

And my script is
============
Code:
#!/usr/bin/perl
## file env.pl

use strict;
use Env;

`echo -e "My home is $HOME\n" > LOG`;
`echo -e "My path is $PATH\n"  >>LOG`;
`echo -e "My username is $USER\n" >>LOG`;

============
it runs manually but not with cron daemon.
Last edited by pludi; 02-12-2010 at 02:52 AM.. Reason: code tags, please...
# 6  
Old 02-17-2010
You should "Shebang" perl

start the script (This must be at the first line of the script)
#!/<Path><To><Perl>

So it should look like this:


#!/usr/bin/perl

on most machines
# 7  
Old 02-18-2010
Solution for this
When we run a perl program from the crontab we can not access the perl modules.So inside the perl program we have to specify the modules in lib.

For example,
consider my module is in the directory /home/user/perlmodules.

So inside the program we need to specify like the following,

use lib /home/karthigayan/perlmodules
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