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 $(pgrep -d, -u UserName)
But still I found it not super human readable.
Is their a native way with ps to filter users ? or to grep it but the keep the LF ?
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psoutputs a newline after every entry. What are you trying to accomplish?Do you have a username that contains a newline character? If so… why?!
Security by overcomplication
Kinda hard to encode it in
/etc/passwd, which separates entries with newlines and fields of an entry with colons.Of course, you can activate some alternative user database in
/etc/nsswitch.confand then you can have your usernames with newlines in them, but at least half of the tools on your system that process usernames will take that personally…
tbh you should prolly use pgrep instead of piping ps into grep
what do you mean the output doesnt keep the LF? what LF?
ps also has -u and -U switches to filter by users
I’m not really sure what it is you’re asking for here. As another commenter said,
psoutputs a list of newline separated entries (using\n, the standard LF character). I even ran some sanity checks to make sure it wasn’t using\r\n(CR LF) with the following:$ ps aux | grep $USER | tr -cd "\n" | wc -m 14 $ ps aux | grep $USER | tr -cd "\r" | wc -m 0The output of
ps aux | grep $USERis consistent with the formatting ofps aux. I also found thatps aux | grep $USERwas consistent withps -fp $(pgrep -d, -u $USER)except thatps -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 ofps auxandgrep --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.