Re: perl script in nohup running from crontab

A couple things that might be worth trying...

# crontab -l
* * * * * perl /root/nfs_share/SCRIPTS/cron_ncp.pl >>/tmp/cron_ncp.tmp
+.txt 2>&1
[download]

That is, redirect output somewhere else, just to be sure there aren't permission issues, and include stderr together with stdout.

#!/usr/bin/perl

use strict;
use warnings;

my $tmp = `ps -ef`;
if ( $tmp !~ /ncp_run.tcl/ ) {
    my $cmd = 'expect -f /root/nfs_share/SCRIPTS/ncp_run.tcl';
    print "starting now: $cmd\n";
    exec $cmd;
}
printf "ncp_run.tcl is already running as of %s: %s\n", scalar(localti
+me),  $tmp );
[download]

That is, output a little more information about what's happening, and use exec instead of system (and do a bit of tidying/tightening up).

Comment on Re: perl script in nohup running from crontab Select or Download Code

Replies are listed 'Best First'.
Re^2: perl script in nohup running from crontab by tanuj (Novice) on Sep 23, 2011 at 09:26 UTC
Thanks graff, cron is executing the script, but now i have a different problem. I have all the scripts under /root/nfs_share/SCRIPTS folder as you can see i was trying to run a script ncp_run.tcl (which is again under SCRIPTS dir). In this ncp_run.tcl file i am socurcing some other files `source resource.conf source init.tcl` [download] so while corn is executing the script it is throwing error `couldn't read file "resource.conf": no such file or directory while executing "source "resource.conf"" (file "/root/nfs_share/SCRIPTS/ncp_run.tcl" line 1)` [download] so is it something like corn is running this in some other environment. here is some of the datails: `[root@perflnx14 SCRIPTS]# which crontab /usr/bin/crontab [root@perflnx14 SCRIPTS]# echo $SHELL /bin/bash [root@perflnx14 SCRIPTS]# echo $PATH /usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/s +bin:/bin:/usr/sbin:/usr/bin:/root/bin:/root/nfs_share/SCRIPTS:/root/n +fs_share/SCRIPTS/ [root@perflnx14 SCRIPTS]# echo $HOME /root` [download] but if i run this script manually `expect -f ncp_run.tcl`</it will work finep> once again thanks for helping me out in this ;-)	[reply] [d/l] [select]
Re^3: perl script in nohup running from crontab by hbm (Hermit) on Sep 23, 2011 at 12:51 UTC
When you log in, your profile is loaded, paths are defined, etc. That does not happen with cron. So, when cron'ing, explicitly define the full path for every file you open.	[reply]
Re^3: perl script in nohup running from crontab by graff (Chancellor) on Sep 23, 2011 at 23:24 UTC
As indicated by hbm above, the next thing to try is to edit the contents of "nap_run.tcl": `source /root/nfs_share/SCRIPTS/resource.conf source /root/nfs_share/SCRIPTS/init.tcl` [download] It's curious that your "nap_run.tcl" file is actually being used/interpreted as a (ba)sh shell script, despite the fact that the ".tcl" extension would lead a casual observer to think that it's actually a tcl script instead. Is it your intention to use the ".tcl" extension on shell scripts? And if "resource.conf" and "init.tcl" don't start with shebang lines, is it your intention that they are also used/interpreted as shell scripts?	[reply] [d/l]


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