Help with cmd while using ps Post: 302947605

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Top Forums Shell Programming and Scripting Help with cmd while using ps Post 302947605 by bakunin on Friday 19th of June 2015 11:46:07 AM

06-19-2015

Registered User

Quote:

Originally Posted by Jojo90

Code:

ps -e -o pid,uname,cmd

how can i split and take only the cmd part from it.

You can of course specifiy only the "cmd"-part in the option-string of ps like Aia has already suggested. If you need all three values you can split these in the shell:

Code:

ps -e -o pid,uname,cmd |\
while read PID UNAME CMD ; do
     print - "PID=$PID , user=$UNAME , command=$CMD"
done

If you use a read command to fill several variables (three in this case) the input to fill them (one line from the output of ps) will be split along word boundaries, so the first "word" goes to the first variable, the second word to the second variable. If there are more "words" in the output than there are variables the last variable gets the whole rest of the line.

So, this works because the first two values are always single "words" (character groups surrounded by blanks), only the last one isn't. It would not work if there would be several multi-word values involved.

I hope this helps.

bakunin

bakunin

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trace-cmd-reset

TRACE-CMD-RESET(1)														TRACE-CMD-RESET(1)

NAME

       trace-cmd-reset - turn off all Ftrace tracing to bring back full performance

SYNOPSIS

       trace-cmd reset [OPTIONS]

DESCRIPTION

       The trace-cmd(1) reset command turns off all tracing of Ftrace. This will bring back the performance of the system before tracing was
       enabled. This is necessary since trace-cmd-record(1), trace-cmd-stop(1) and trace-cmd-extract(1) do not disable the tracer, event after the
       data has been pulled from the buffers. The rational is that the user may want to manually enable the tracer with the Ftrace pseudo file
       system, or examine other parts of Ftrace to see what trace-cmd did. After the reset command happens, the data in the ring buffer, and the
       options that were used are all lost.

OPTIONS

       -b buffer_size
	   When the kernel boots, the Ftrace ring buffer is of a minimal size (3 pages per CPU). The first time the tracer is used, the ring
	   buffer size expands to what it was set for (default 1.4 Megs per CPU).

	       If no more tracing is to be done, this option allows you to shrink the
	       ring buffer down to free up available memory.

	       trace-cmd reset -b 1

SEE ALSO

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-split(1),
       trace-cmd-list(1), trace-cmd-listen(1)

AUTHOR

       Written by Steven Rostedt, <rostedt@goodmis.org[1]>

RESOURCES

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

COPYING

       Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

	1. rostedt@goodmis.org
	   mailto:rostedt@goodmis.org

								    06/11/2014							TRACE-CMD-RESET(1)

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