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Top Forums Shell Programming and Scripting ps -eaf gives inconsistent result Post 302518136 by rebels on Thursday 28th of April 2011 04:50:55 PM
Old 04-28-2011
ps -eaf gives inconsistent result

The command ps -eaf gives inconsistent result when executed on XYZ server (the command shows 1, 2 or 3 instances of the process. Ideally it should show only 1). I have attached the script file that was executed and the corresponding output. When the same script was executed on ABC server it gave the desired result.

XYZ : Is a VM instance running Linux (Red Hat Enterprise Linux Server release 5.5 (Tikanga))
ABC : Physical server running Linux (Red Hat Enterprise Linux AS release 4 (Nahant Update 7))

I would like to know that XYZ being a VM instance are there any environmental settings or issues which might result in such a behavior? Any inputs on this are appreciated.

Thanks!!
 

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wait(1) 						      General Commands Manual							   wait(1)

NAME
wait - await process completion SYNOPSIS
[pid] DESCRIPTION
If no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina- tions. If a numeric argument pid is given and is the process ID of a background process, waits until that process has completed. Other- wise, if pid is not a background process, exits without waiting for any processes to complete. Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)). Command-Line Arguments supports the following command line arguments: The unsigned decimal integer process ID of a command, whose termination is to wait for. WARNINGS
Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for. SEE ALSO
csh(1), ksh(1), sh-posix(1), sh(1), wait(2). STANDARDS CONFORMANCE
wait(1)
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