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Full Discussion: bash scripting cannot executed in crontab
Top Forums Shell Programming and Scripting bash scripting cannot executed in crontab Post 89200 by jyoung on Friday 11th of November 2005 10:23:25 AM
Old 11-11-2005
This part in the Cron tutorial speaks to your problem:

It works from the command line but not in crontab

This is perhaps our number one complaint with cron. When you login to Unix, startup scripts setup your environment. You can see your environment with the commands "printenv" or "env". On the other hand, cron sets up only a sparse environment (See Problem with crontab for the details.)

I think that the best solution is to write shell scripts that set up their own environment and run these via cron. That's what worked in not running in cron.

In ping from cron, the user used an absolute path rather than redefining the PATH environment variable.

In this thread: Cron problem?, the user sourced the .profile file to set up the environment and it worked. But that technique caused a problem in stty: tcgetattr: Not a typewriter And I also think that it sets you up for a mysterious problem. Change .profile and your cronjobs may suddenly fail.

Check that part out and the links provided. They should point you in the right direction. Good Luck.
 

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LEARN ABOUT REDHAT

cron

CRON(8) 						      System Manager's Manual							   CRON(8)

NAME

       cron - daemon to execute scheduled commands (Vixie Cron)

SYNOPSIS

       cron

DESCRIPTION

       Cron should be started from /etc/rc or /etc/rc.local.  It will return immediately, so you don't need to start it with '&'.

       Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory.  Cron
       also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see  crontab(5)).	Cron  then
       wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute.  When execut-
       ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab,	if
       such exists).

       Additionally,  cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
       cron will then examine the modtime on all crontabs and reload those which have changed.	Thus cron need not be restarted whenever a crontab
       file is modified.  Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.

SEE ALSO

       crontab(1), crontab(5)

AUTHOR

       Paul Vixie <paul@vix.com>

4th Berkeley Distribution					 20 December 1993							   CRON(8)
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