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Full Discussion: "if" Loop not working when executing script using cron
Top Forums Shell Programming and Scripting "if" Loop not working when executing script using cron Post 302901383 by sk2code on Tuesday 13th of May 2014 02:40:31 PM
Old 05-13-2014
"if" Loop not working when executing script using cron
I am facing this weird issue where the script is working fine from the command line but when I am executing it from cron though it is working fine but the "if" loop is processing else part though I know that the if part of the logic is true and ideally the loop should execute the if portion.

After executing the script though I am getting the value for the variable SZ=0 but for some reason the script is going to the else portion of the logic. This is only happening while running the script from cron.

Please help.

Code:
#!/bin/bash

for m in `cat /export/home/sk/sk.hosts.list`; do ping -a $m; done > /export/home/sk/sk.ping.host

awk '!/no/' /export/home/sk/sk.ping.host > /export/home/sk/sk.ping.alive

SZ=$(more /export/home/sk/sk.ping.alive | wc -c);

if [ $SZ == 0 ] ;

then mailx -s "All servers are getting backed up" sk@abc.com < /export/home/sk/sk.ping.alive

else

awk '{print $1}' /export/home/sk/sk.ping.alive > /export/home/sk/sk.ping.dead

mailx -s "Following servers are not getting backed up" sk@abc.com < /export/home/sk/sk.ping.dead

fi

Here is my crontab entry:

Code:
30 13 * * * /export/home/sk/bkup.chk.test.sk > /dev/null 2>&1

 

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LEARN ABOUT DEBIAN

apticron

apticron(1)						      General Commands Manual						       apticron(1)

NAME

       apticron - Generate a mail listing packages which are pending an upgrade

SYNOPSIS

       apticron [--cron]

DESCRIPTION

       apticron is a shell script which generates a mail with a list of all packages currently pending an upgrade, as well as summary of changes -
       using apt-listchanges - to a configurable Email address.

       apticron is mainly intended for automatic notification of pending security updates but can also be used	in  many  other  situations  where
       timely updates are necessary.

       The --cron option is only meant to be used when invoked by cron in order to run no more than once a day.

FILES

       /etc/apticron/apticron.conf
	      Configuration file, Email address to mail and profile for use with apt-listchanges are configurable.

       /etc/cron.d/apticron
	      Cron job for executing apticron daily.

       /etc/cron.daily/apticron
	      Fallback cron script for executing apticron (if no crond running or system down at designated time).

       /var/lib/misc/apticron.cron
	      Time stamp file used by apticron when invoked with --cron option.

SEE ALSO

       apt-get(8), apt-listchanges(1), cron(8)

AUTHOR

       Apticron  was initially developed by Colm MacCarthaigh <colm.maccarthaigh@heanet.ie> with contributions from Marc Sherman <msherman@projec-
       tile.ca>. Since 2006 it is maintained and improved by Tiago Bortoletto Vaz <tiago@debian.org>.

																       apticron(1)
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