How to format output of ps -p command?
To not show me something like this:
PID TTY TIME CMD
but just PIDs.
I'm using Linux.
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4 Answers
Use the -o option to select which columns are displayed. If you put = after the column name, the header line is suppressed.
ps -o pid= -p 1 23 456
ps -o pid= -o ppid= -o pgid= -o sid= -p 1 23 456
answered Sep 30, 2015 at 0:53
Gilles 'SO- stop being evil'
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1This answer has the benefit of being portable (supported by BSDs and specified by POSIX.Anthony Geoghegan– Anthony Geoghegan2019-09-13 13:50:42 +00:00Commented Sep 13, 2019 at 13:50
Use the --no-headers to have the header line omitted.
Original output:
ps
PID TTY TIME CMD
27027 pts/0 00:00:00 bash
27071 pts/0 00:00:00 ps
With --no-headers:
ps --no-headers
27027 pts/0 00:00:00 bash
27072 pts/0 00:00:00 ps
Combining with -p:
ps -p 1 --no-headers
1 ? 00:00:33 systemd
The man page for ps clearly documents this:
man ps
[snip]
--no-headers
Print no header line at all. --no-heading is an alias for this option.
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4Doesnt work on macos. Naturall -____-Avindra Goolcharan– Avindra Goolcharan2017-02-10 04:49:54 +00:00Commented Feb 10, 2017 at 4:49
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Indeed. Wasn't expected to work on MacOS. Question solely concerned Linux, as highlighted by the original poster.steve– steve2017-02-10 14:53:40 +00:00Commented Feb 10, 2017 at 14:53
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3np steve. Just documenting it here for future readers. The minor differences between BSD and Linux utils is highly irritating. sed is the worstAvindra Goolcharan– Avindra Goolcharan2017-02-11 01:52:17 +00:00Commented Feb 11, 2017 at 1:52
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ok thx. if you've any thoughts on how to include MacOS solution in answer I'll happily revise it!steve– steve2017-02-11 09:46:01 +00:00Commented Feb 11, 2017 at 9:46
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2i found that for particular column headers, putting a
=after the column name to theoflag is a cross-platform way to do this. E.g.,ps -p ${pid} -o state=will show the process state for${pid}, without the header. (Which is what the accepted answer states :) )Avindra Goolcharan– Avindra Goolcharan2017-02-11 16:17:35 +00:00Commented Feb 11, 2017 at 16:17
Use
ps -p <PIDs> --no-headers
to get a list of PIDs without the header.
To get a list of only the PIDs use:
ps -eo pid
See also man ps section 'STANDARD FORMAT SPECIFIERS' for possible colums.
Personally I like the way Solaris shows the possible columns to use for the -o argument:
ps: option requires an argument -- o
usage: ps [ -aAdefHlcjLPyZ ] [ -o format ] [ -t termlist ]
[ -u userlist ] [ -U userlist ] [ -G grouplist ]
[ -p proclist ] [ -g pgrplist ] [ -s sidlist ] [ -z zonelist ] [-h lgrplist]
'format' is one or more of:
user ruser group rgroup uid ruid gid rgid pid ppid pgid sid taskid ctid
pri opri pcpu pmem vsz rss osz nice class time etime stime zone zoneid
f s c lwp nlwp psr tty addr wchan fname comm args projid project pset lgrp
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1This does not address the issue of removing the header that is displayed.2019-09-13 12:44:17 +00:00Commented Sep 13, 2019 at 12:44
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That's how you interpret 'just display PID'. Some can interpret this of just selecting one column, or as you apparently interpret: just values.Lambert– Lambert2019-09-13 14:16:09 +00:00Commented Sep 13, 2019 at 14:16