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Re: perl script in nohup running from crontab

by nimdokk (Vicar)
on Sep 22, 2011 at 12:23 UTC ( #927346=note: print w/ replies, xml ) Need Help??


in reply to perl script in nohup running from crontab

Can you run the script outside of cron? all by itself from the commandline? Without using Perl?


Comment on Re: perl script in nohup running from crontab
Re^2: perl script in nohup running from crontab
by raybies (Chaplain) on Sep 22, 2011 at 12:27 UTC

    ALSO, cron has minimal path provided by a minimal shell, so if it runs on your default shell, it may still not run in cron...

    if the user installed expect or nohup in a dir that's not accessible in cron's shell, you may need to hardpath (provide the full path to every executable run in a script run in cron) them, for them to work within cron.

      i added the full path as /use/bin/expect but still no luck.
        Have you specified the full path of nohup, too?
        You may also want to look at re-setting environment variable for PATH within the script so that the system knows how to find all the executables (/usr/bin, etc.) instead of hardcoding them all in to the command.
Re^2: perl script in nohup running from crontab
by tanuj (Novice) on Sep 22, 2011 at 13:37 UTC
    yes I am able to run this script out side the cron. even if the modify the same script $cmd=date and run the same script it will work in corn. so i have some doubt in $cmd='nohup expect -f /root/nfs_share/SCRIPTS/ncp_run.tcl &';

      Any errors in /var/cron/log or wherever you system keeps them? If you can't view that log, add 2>&1 (or whatever is appropriate on your system) to redirect STDERR to your own log file.

      Your cron entry starts with "perl". Why, when you have #!/usr/bin/perl in your script?

      I'd also add #!/path/to/expect -f to the .tcl, to simplify your $cmd.

      And excessive pipe alert in your grep...

      [root@perflnx14 SCRIPTS]# crontab -l * * * * * /root/nfs_share/SCRIPTS/cron_ncp.pl >>/root/nfs_share/SCRIPT +S/temp.txt ---------------- cron_tab.pl script: #!/usr/bin/perl use warnings; use strict; #my $cmd='nohup expect -f /root/nfs_share/SCRIPTS/ncp_run.tcl &'; my $cmd='nohup /root/nfs_share/SCRIPTS/ncp_run.tcl &'; #my $tmp= `ps -ef | grep -v grep | grep ncp_run.tcl | wc -l`; my $tmp= `ps -ef | grep -c [n]cp_run.tcl`; if($tmp == 1) { print"already running\n"; } else { print"not running\n"; system $cmd; }
        ya i tried with putting the patj /usr/bin/expect ..but no luck in logs everything looks fine to me:
        [root@perflnx14 SCRIPTS]# tail /var/log/cron Sep 21 23:15:01 perflnx14 crond[1932]: (root) CMD (perl /root/nfs_shar +e/SCRIPTS/cron_ncp.pl >>/root/nfs_share/SCRIPTS/temp.txt) Sep 21 23:16:01 perflnx14 crond[1947]: (root) CMD (perl /root/nfs_shar +e/SCRIPTS/cron_ncp.pl >>/root/nfs_share/SCRIPTS/temp.txt) Sep 21 23:17:01 perflnx14 crond[1972]: (root) CMD (perl /root/nfs_shar +e/SCRIPTS/cron_ncp.pl >>/root/nfs_share/SCRIPTS/temp.txt)

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