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 ?
tbh you should prolly use pgrep instead of piping ps into grep
ps
outputs 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.conf
and 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…
what do you mean the output doesnt keep the LF? what LF?
ps also has -u and -U switches to filter by users
If I do
ps aux | grep root
, then the newline is preserved. So I’m not sure what exactly the problem is. There is a user option for ps, but it does not work with aux,ps --user root
.Btw if you grep, then I recommend using
^user
, so it only matches the beginning of each line (the actual username), asps aux | \grep ^root
(notice the backslash). Do you have an alias for grep? Try\grep
instead. The backslash in front of the command will use the actual command and ignore your alias.Here is a little bonus to have in mind: You can convert newline characters to null, then grep with option null, and at last convert null characters back to newline. Now I don’t think its useful in this case, but its good to know; therefore its a bonus information:
ps aux | tr '\n' '\0' | \grep --null-data ^root | tr '\0' '\n'