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Running same script through cron gives different output

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# 1  
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
# 2  
Old 04-10-2013
For 24 hour format set LC_TIME to POSIX

eg:


Code:
LC_TIME="POSIX" sar -tu 5 1 |  awk ...

or for AM/PM
Code:
LC_TIME= sar -tu 5 1 |  awk ...

# 3  
Old 04-10-2013
Hi Chubler_XL,

Will this help resolve in getting the expected output by running the sript through cron?

Thanks,
a1_win
# 4  
Old 04-10-2013
yes it should do
# 5  
Old 04-10-2013
Hi Chubler_XL,

The issue is not resolved after setting the code as below:

Code:
LC_TIME="POSIX" sar -tu 5 1 |  awk ...

It still gives the incorrect output while running the script through cron as metioned earlier in this post:

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



Expected output should be:

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 other suggestions please?

Thanks,
a1_win
# 6  
Old 04-10-2013
Well you have something in your environment cron doesnt have...
What do you have in your env that could be time display related?
# 7  
Old 04-10-2013
Your two outputs show totally different columns. I doubt they are created by the same, identical script, once run interactively, and once by cron.
As cron will deploy a very limited environment, sourcing your ~/.profile may help defining the environment you are used to use interactively, but make sure you source it from the absolute path.
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