93 lines
1.7 KiB
Bash
Executable file
93 lines
1.7 KiB
Bash
Executable file
#!/bin/bash
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: <<=cut
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=pod
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=head1 NAME
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pidtree - List children of process ID
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=head1 SYNOPSIS
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B<pidtree> I<pid> [I<pids>]
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=head1 DESCRIPTION
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B<pidtree> lists the process IDs of the (grand*)children of the I<pid>.
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=head1 EXAMPLES
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Show the tree for all processes on the system:
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pidtree 1
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Show the tree for this process:
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pidtree $$
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Kill process and all (grand*)children:
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pidtree 12345 | xargs kill
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=head1 AUTHOR
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Copyright (C) 2020 Ole Tange,
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http://ole.tange.dk and Free Software Foundation, Inc.
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=head1 LICENSE
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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at your option any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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=head1 DEPENDENCIES
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B<pidtree> uses B<ps>.
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=head1 SEE ALSO
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B<ps>, B<pstree>.
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=cut
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_pidtree() {
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declare -A children
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# Make table pid => child pids
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# This way we only run 'ps' once
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while read pid parent ; do
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children[$parent]+=" $pid"
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done < <(ps -e -o pid,ppid)
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__pidtree() {
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# Indent pid with spaces ($1)
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echo "$1$2"
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for child in ${children["$2"]} ; do
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__pidtree " $1" "$child"
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done
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}
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for pid in "$@" ; do
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__pidtree '' "$pid"
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done
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}
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_pidtree "$@"
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