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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

irsend

IRSEND(1)							   User Commands							 IRSEND(1)

NAME

       irsend - basic LIRC program to send infra-red commands

SYNOPSIS

       irsend [options] DIRECTIVE REMOTE CODE [CODE...]

DESCRIPTION

       Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such
       as TV boxes, HiFi sets, etc.

       DIRECTIVE can be:
	  SEND_ONCE	    - send CODE [CODE ...] once
	  SEND_START	    - start repeating CODE
	  SEND_STOP	    - stop repeating CODE
	  LIST		    - list configured remote items
	  SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
	  SIMULATE	    - simulate IR event

       REMOTE is the name of a remote, as described in the lircd configuration file.

       CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file.

       NUM is the transmitter number of the hardware device.

       For the LIST DIRECTIVE, REMOTE and/or CODE can be empty:

	  LIST	 ""    ""   - list all configured remote names
	  LIST REMOTE  ""   - list all codes of REMOTE
	  LIST REMOTE CODE  - list only CODE of REMOTE

       The SIMULATE command only works if it has been explicitly enabled in lircd.

       -h --help
	      display usage summary

       -v --version
	      display version

       -d --device
	      use given lircd socket [/var/run/lirc/lircd]

       -a --address=host[:port]
	      connect to lircd at this address

       -# --count=n
	      send command n times

EXAMPLES

	  irsend LIST DenonTuner ""
	  irsend SEND_ONCE  DenonTuner PROG-SCAN
	  irsend SEND_ONCE  OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP
	  irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3
	  irsend SEND_STOP  OnkyoAmpli VOL-DOWN
	  irsend SET_TRANSMITTERS 1
	  irsend SET_TRANSMITTERS 1 3 4
	  irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S"

FILES

       /etc/lirc/lircd.conf
	      Default lircd configuration file.  It should contain all the remotes, their infra-red codes and the corresponding timing	and  wave-
	      form details.

DIAGNOSTICS

       If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics:
       "irsend: could not connect to socket"
       "irsend: Connection refused" (or "Permission denied").

SEE ALSO

       The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.

       lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org.

irsend 0.9.0-pre1						   October 2010 							 IRSEND(1)
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