this post was submitted on 02 Oct 2024
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how output ps aux | grep aUser and keeping Newline ? (lemmy.ml)
submitted 2 months ago by Gordon_F@lemmy.ml to c/linux@lemmy.ml
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Hi,

by doing a

ps aux | grep UserName

The output do not keep the LF[^1] 😡

I've found some solution online by they involve 3 or more pipe | !

On my side, I've made this

ps -fp $(pgrep -d, -u UserName)

But still I found it not super human readable.

Is their a native way with ps to filter users ? or to grep it but the keep the LF ?

[^1]: linefeed https://en.wikipedia.org/wiki/Linefeed#Representation

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[–] Para_lyzed@lemmy.world 2 points 2 months ago* (last edited 2 months ago)

I'm not really sure what it is you're asking for here. As another commenter said, ps outputs a list of newline separated entries (using \n, the standard LF character). I even ran some sanity checks to make sure it wasn't using \r\n (CR LF) with the following:

$ ps aux | grep $USER | tr -cd "\n" | wc -m
14
$ ps aux | grep $USER | tr -cd "\r" | wc -m
0

The output of ps aux | grep $USER is consistent with the formatting of ps aux. I also found that ps aux | grep $USER was consistent with ps -fp $(pgrep -d, -u $USER) except that ps -fp $(pgrep -d, -u $USER) shows the header (UID PID PPID C STIME TTY TIME CMD), does not show the processes related to the command (entries of ps aux and grep --color=auto $USER), and does not show grep's keyword matching by highlighting all matches within a line. It is otherwise completely identical.

Can you provide the output that you are getting that is unsatisfactory to you? I don't think I can otherwise understand where the issue is.