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Full Discussion: Running same script through cron gives different output
Top Forums Shell Programming and Scripting Running same script through cron gives different output Post 302792171 by a1_win on Tuesday 9th of April 2013 10:38:28 PM
Old 04-09-2013
Running same script through cron gives different output
Hi All,

I am running the below shell script through cron and surprisingly it gives different output

Code:
$uname -a
Linux 2.6.18-194.3.1.7.3.el5xen #1 SMP Fri Jul 30 00:08:45 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux


Code:
$ echo $SHELL
/bin/bash


Code:
shell script:

cat sar_cpu.sh

#!/bin/bash


hdr=1
while true; do
  sar -u 10 1 |  awk '/user/{if(hdr){print $1,$2,$4,$6,$7};next} /^[0-9]/{print $1,$2,$4,$6,$7}'  OFS=, hdr=$hdr >> /sar_cpu_`date +%m%d%y`.csv
  sleep 5
  hdr=0
done



Code:
Output when the script runs through cron:

$ cat sar_cpu_040913.csv

20:09:01,CPU,%nice,%iowait,%steal
20:09:11,all,0.00,0.05,0.00
20:09:22,all,0.00,0.03,0.00
20:09:33,all,0.00,0.05,0.03
20:09:44,all,0.00,0.03,0.00
20:09:55,all,0.00,0.03,0.00
20:10:06,all,0.00,0.03,0.00
20:10:17,all,0.00,0.03,0.03
20:10:28,all,0.00,0.03,0.00
20:10:39,all,0.00,0.03,0.00
20:10:50,all,0.00,0.03,0.00
20:11:01,all,0.00,0.25,0.02
20:11:12,all,0.00,0.00,0.00
20:11:23,all,0.00,0.02,0.00
20:11:34,all,0.00,0.03,0.03
20:11:45,all,0.00,0.02,0.00
20:11:56,all,0.00,0.05,0.00
20:12:07,all,0.00,0.05,0.00
20:12:18,all,0.00,0.05,0.03


I get the expected output when the script is run manually as below:

Code:
$ ./sar_cpu.sh &
or 
$ nohup ./sar_cpu.sh &


Expected output:

Code:
$ cat sar_cpu_040913.csv

05:35:27,PM,%user,%system,%iowait
05:35:37,PM,0.18,0.00,0.03
05:35:48,PM,0.20,0.00,0.15
05:35:59,PM,0.15,0.03,0.03
05:36:10,PM,1.13,1.68,0.55
05:36:22,PM,0.08,0.00,0.03
05:36:33,PM,0.10,0.03,0.00
05:36:44,PM,0.23,0.50,0.00
05:36:55,PM,0.33,0.03,0.03
05:37:06,PM,0.15,0.00,0.00

Any suggestions please as to what is going wrong while executing the same script through cron?

Thanks for your time!

Regards,
a1_win
 

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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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