I want to monitor only a process and its children processes on htop. Filtering on the name of the parent process lists only the parent process, not its children. How do I show the children processes too?
9
7
Under Linux, you can do:
htop -p `pstree -p $PID | perl -ne 'push @t, /\((\d+)\)/g; END { print join ",", @t }'`
where $PID is the root process. This works as follows:
- The list of the wanted processes are obtained with
pstree, using the-poption to list them with their PID. - The output is piped to a Perl script that retrieves the PID's, using a regular expression (here,
\((\d+)\)), and outputs them separated with commas. - This list is provided as an argument of
htop -p.
For other OS like Mac OS, you may need to adapt the regular expression that retrieves the PIDs.
Note: It is unfortunately not possible to update the list with new children that are spawn later, because once htop has been executed, one cannot do anything else. This is a limitation of htop (current version: 2.0.2).
-
-
@becko
$PIDhas to be the pid, but you can get the id from the name of the process withpgrep. – vinc17 Feb 7 '15 at 18:25 -
5this will not update when new children are spawned though... would love to use sth like it for monitoring only stuff in my tmux session – black_puppydog Sep 18 '15 at 10:06
-
-
On macOS with
pstreefrom homebrew:htop -p `pstree -p $PID | perl -ne 'push @t, /--- (\d+) /g; END { print join ",", @t }'`– jpsim Jul 27 '17 at 19:12
0
htop -p $(ps -ef | awk -v proc=15305 '$3 == proc { cnt++;if (cnt == 1) { printf "%s",$2 } else { printf ",%s",$2 } }')
Use awk to create a comma separated list of process id's from the output of ps -ef passing the parent process id as proc and then passing this out to htop -p.
