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/usr/share/bash-completion/completions/clusterssh is in clusterssh 4.13-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# -*- mode: shell-script; sh-basic-offset: 8; indent-tabs-mode: t -*-
# ex: ts=8 sw=8 noet filetype=sh
#
# cssh(1) completion by Aaron Spettl <aaron@spettl.de>, adapted from the
# Debian GNU/Linux dput(1) completion by Roland Mas <lolando@debian.org>
#
# On Debian (and Debian based distributions) drop this file into 
#   /etc/bash_completion.d 
# and source the /etc/bash_completion script - or just restart bash.

_cssh ()
{
	local cur prev options paroptions clusters extra_cluster_file_line clusters_line extra_cluster_file

	COMPREPLY=()
	cur=${COMP_WORDS[COMP_CWORD]}
	prev=${COMP_WORDS[COMP_CWORD-1]}

	# all options understood by cssh
	options='-c --cluster-file -C --config-file --debug -e --evaluate \
	         -g --tile -G --no-tile -h --help -H --man -l --username \
	         -o --options -p --port -q --autoquit -Q --no-autoquit \
	         -s --show-history -t --term-args -T --title \
	         -u --output-config -v --version'

	# find the extra cluster file line in the .clusterssh/config or, alternatively, /etc/csshrc
	extra_cluster_file_line="`grep '^[[:space:]]*extra_cluster_file' $HOME/.clusterssh/config 2> /dev/null`"
	[ -z "$extra_cluster_file_line" ] && extra_cluster_file_line="`grep '^[[:space:]]*extra_cluster_file' /etc/csshrc 2> /dev/null`"

	# find the clusters line in the .csshrc or, alternatively, /etc/csshrc
	clusters_line="`grep '^[[:space:]]*clusters' $HOME/.clusterssh/config 2> /dev/null`"
	[ -z "$clusters_line" ] && clusters_line="`grep '^[[:space:]]*clusters' /etc/csshrc 2> /dev/null`"

	# extract the location of the extra cluster file
	extra_cluster_file="`echo $extra_cluster_file_line | cut -f 2- -d '='`"
	[ -n "$extra_cluster_file" ] && extra_cluster_file="`eval echo $extra_cluster_file`"
	                                                   # TODO: don't use eval to expand ~ and $HOME

	# get the names of all defined clusters
	clusters=$(
	{
		[ -n "$clusters_line" ] && echo "$clusters_line" | cut -f 2- -d '=' | tr "$IFS" "\n" || /bin/true
		[ -n "$extra_cluster_file" ] && sed -e 's/^\([a-z0-9.-]\+\).*$/\1/i' "$extra_cluster_file" 2> /dev/null || /bin/true
		sed -e 's/^\([a-z0-9.-]\+\).*$/\1/i' /etc/clusters 2> /dev/null || /bin/true
		sed -e 's/^\([a-z0-9.-]\+\).*$/\1/i' $HOME/.clusterssh/clusters 2> /dev/null || /bin/true
	} | sort -u)

	# use options and clusters for tab completion, except there isn't yet
	# at least one character to filter by
	# reason: don't show options if the user types "cssh <tab><tab>"
	paroptions="$clusters"
	[ -n "$cur" ] && paroptions="$paroptions $options"

	case $prev in
	--cluster-file|-c|--config-file|-C)
		COMPREPLY=( $( compgen -o filenames -G "$cur*" ) )
		;;
	*)
		COMPREPLY=()

		# also use ssh hosts for tab completion if function _known_hosts is present
		[ "`type -t _known_hosts`" = "function" ] && _known_hosts -a

		COMPREPLY=( "${COMPREPLY[@]}" $( compgen -W "$paroptions" | grep "^$cur") )
		;;
	esac

	return 0
} &&
complete -F _cssh cssh crsh ctel