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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 REDHAT

pppoeconf

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

NAME

       pppoeconf -- configures a PPPoE (ADSL) connection

SYNOPSIS

       pppoeconf [-nox]  [iface]

DESCRIPTION

       The  pppoeconf  program	is  user-friendly  dialog based setup tool for pppd (and pppoe	    if needed). It will look for existing ethernet
       cards and look for ADSL hardware connected to one of them. You can add an interface name iface to force pppoeconf to use it. Then  it  will
       get some login info and do some minor modifications to make working settings. Note that you can use ESC key to exit program when you wan.

OPTIONS

       -nox	 Force ncurses use.

FILES

       /etc/ppp/peers/dsl-provider is pppd options file for your dsl provider.

       /etc/ppp/pap-secrets and /etc/ppp/chap-secrets are described in pppd documentation.  pppoeconf may add lines to theses files.

       /etc/ppp/ip-up.d/0clampmss and /etc/ppp/ip-down.d/0clampmss are used to clamp MSS if needed.

       /etc/network/interfaces is network interface file for your system.

SEE ALSO

       pppd(8), interfaces(5), pon(1) and pppoe(8).

AUTHOR

       This  manual  page  was originally written by Eduard Bloch (blade@debian.org) and now maintained by Gregory Colpart (reg@evolix.fr) for the
       Debian GNU/Linux system (but may be used by others).  This document is free software; you can redistribute it and/or modify  it	under  the
       terms  of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option)
       any later version.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																      PPPOECONF(8)
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