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Full Discussion: Script runs good manually but failing via crontab
Top Forums Shell Programming and Scripting Script runs good manually but failing via crontab Post 302899220 by rbatte1 on Monday 28th of April 2014 05:49:45 AM
Old 04-28-2014
You are expecting that the environment for a cron job is the same as when you log in. This is not the case and is a very common mistake, probably including everyone who has ever tried it.

The easiest way to work out what is different is to fire in a cron job that just does:-
Code:
env > /tmp/cron_env
set > /tmp/cron_set
alias > /tmp/cron_alias
function > /tmp/cron_function

Make sure you use cron and not at to schedule this. The at command takes your current environment (including current directory) to run a job once.

You can then run the same commands on the command line and compare the output.

A common way to fill in the blanks is to call an environment script at the start of all your cron jobs. For example:-
Code:
#!/bin/ksh
# Your normal coding comments
# Update history or whatever you like
# Blah blah blah

# Setting environment
. /full/path/my_cron_env

# Run my code
a=1
exit 0

The my_cron_env or whatever you call it is the same format as your .profile


I hope that this helps,
Robin
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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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