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Full Discussion: Bash script acting funny when run from Crontab
Top Forums Shell Programming and Scripting Bash script acting funny when run from Crontab Post 302913418 by mkoster on Saturday 16th of August 2014 01:46:16 PM
Old 08-16-2014
Bash script acting funny when run from Crontab
Hello, first time here. I have a script that seems to ignore the if statement when run from the cron. I am using Ubuntu 12.10

Code:
#!/bin/bash

DOWN=/usr/sbin/dcon
UP="pon dsl-provider"
LOG=/var/log/dsl-reconnect.log

RECV=`ifconfig 2>&1|grep ppp0|cut -d , -f 5|cut -d " " -f 1`

if [[ $RECV != *ppp* ]]
then
echo "connecting..."
echo ----- >>$LOG
date>>$LOG
$DOWN >>$LOG 2>&1
wait for kill
sleep 3
echo "hopefully killed"
$UP >>$LOG 2>&1
fi

When run from console, the script works the way it should, I even tested by echoing $RECV before the if statement and it shows hat it holds the value ppp0, however when run from cron, it doesn't seem to work right, it does everything within the if statement, killing the connection and reconnecting it, regardless if its already connected.

BTW, This is a modified script from this site - www dot khattam dot info/howto-auto-re-connect-to-dsl-pppoe-in-linux-2010-03-07.html which didn't work at all for me. I tried using the pppoe settings but Ubuntu seems to ignore the settings.

---------- Post updated at 01:46 PM ---------- Previous update was at 12:59 PM ----------

Ok, fixed it, seems when you place something in the cron using crontab -e the environment ignores /sbin/ so I made it do the command /sbin/ifconfig and it works fine.
Last edited by rbatte1; 08-16-2014 at 05:21 PM.. Reason: Spelling and ICODE tags
 

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LEARN ABOUT SUNOS

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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