Bash script acting funny when run from Crontab Post: 302913418

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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

08-16-2014

Registered User

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 OSF1

cron

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

NAME

       cron - The system clock daemon

SYNOPSIS

       /usr/sbin/cron

DESCRIPTION

       The cron daemon runs shell commands at specified dates and times.  Commands that are to run according to a regular or periodic schedule are
       found within the crontab files.	Commands that are to run once only are found within the at files.  You submit crontab and at file  entries
       by  using  the  crontab	and  at  commands.  Because the cron process exits only when killed or when the system stops, only one cron daemon
       should exist on the system at any given time.  Normally, you start the cron daemon from within a run command file.

       During process initialization and when cron detects a change, it examines the crontab and at files.  This strategy reduces the overhead	of
       checking  for  new  or  changed files at regularly scheduled intervals.	The cron command creates a log of its activities.  The cron daemon
       must be started from the system startup scripts because it must begin execution without a login user ID set.  The cron daemon  starts  each
       job  with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
       and real group IDs Supplementary groups

       It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
       ing process: Audit control and disposition masks Kernel authorizations

DIAGNOSTICS

       The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.

FILES

       Specifies the command path.  Main cron directory Directory containing the crontab files.  List of allowed users.  List of denied users His-
       tory information for cron Queue description file for at, batch, and cron

RELATED INFORMATION

       Commands:  at(1), crontab(1), rc0(8), rc2(8), rc3(8)

       Files: queuedefs(4) delim off

																	   cron(8)

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