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diff --git a/src/systemd-cgtop/systemd-cgtop.completion.bash b/src/systemd-cgtop/systemd-cgtop.completion.bash
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+# systemd-cgtop(1) completion -*- shell-script -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2014 Thomas H.P. Andersen
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+__contains_word() {
+ local w word=$1; shift
+ for w in "$@"; do
+ [[ $w = "$word" ]] && return
+ done
+}
+
+__get_machines() {
+ local a b
+ machinectl list --no-legend --no-pager | { while read a b; do echo " $a"; done; };
+}
+
+_systemd_cgtop() {
+ local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
+ local comps
+
+ local -A OPTS=(
+ [STANDALONE]='-h --help --version -p -t -c -m -i -b --batch -r --raw -k -P'
+ [ARG]='--cpu --depth -M --machine --recursive -n --iterations -d --delay --order'
+ )
+
+ _init_completion || return
+
+ if __contains_word "$prev" ${OPTS[ARG]}; then
+ case $prev in
+ --machine|-M)
+ comps=$( __get_machines )
+ ;;
+ --recursive)
+ comps='yes no'
+ ;;
+ --order)
+ comps='path tasks cpu memory io'
+ ;;
+ esac
+ COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
+ return 0
+ fi
+
+ COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") )
+}
+
+complete -F _systemd_cgtop systemd-cgtop