Place it in ~/.bash_completion.d

.bash_completion

# debian, ubuntu do not support user generated bash_completion.d
# refs:
# - http://www.debian-administration.org/articles/316
# -	http://www.debian-administration.org/article/An_introduction_to_bash_completion_part_2

DIR="${HOME}/.bash_completion.d"
# source completion directory definitions
if [ -d $DIR -a -r $DIR -a -x $DIR ]; then
	for i in $DIR/*; do
		[ \( -f $i -o -h $i \) -a -r $i ] && . $i
	done
fi
unset i
unset DIR

dz

# deploy-zone - bash completion
# https://github.com/wiedi/deploy-zone
# Thomas Merkel <[email protected]>

_dz() {
	local cur prev
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"

	case ${prev} in
		shell|start|stop)
			local uuid=$( cat ~/.dz/vms.json | jq -r '.[][].uuid' )
			COMPREPLY=( $(compgen -W "${uuid}" -- ${cur}) )
			;;
		list)
			local options=$( dz list --help | grep "^    " | awk -F'[,]' '{ print $1 }' )
			COMPREPLY=( $(compgen -W "${options}" -- ${cur}) )
			;;
		*)
			local commands=$( dz --help | grep "^    " | awk '{ print $1 }' )
			COMPREPLY=( $(compgen -W "${commands}" -- ${cur}) )
			;;
	esac
}

complete -F _dz dz

# vim:ft=sh: