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Top Forums Shell Programming and Scripting How to change a PS attribute? Post 303008022 by Scott on Saturday 25th of November 2017 12:38:19 PM
Old 11-25-2017
FS is the (awk) field separator. In most cases, you could just replace that with a space (" "). Using FS is mostly only useful if you provide awk with a field separator to begin with (which is not the case here). The 1 at the end is a condition, which is always true, which performs an action. The default action is print. As no action is given, the 1 will just "print" the line.

This could be re-written as, for example:
Code:
ps ... | awk '{$5 = $5 FS $5-$4 FS; print}'

Or
Code:
ps ... | awk '{$5 = $5 FS $5-$4 FS}{print}'

 

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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-x] [-o omitpid] [-o omitpid..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. NOTES
pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)
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