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/usr/share/bash-completion/completions/debdiff is in devscripts 2.16.2ubuntu3.

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The actual contents of the file can be viewed below.

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# Debian debdiff(1) completion                             -*- shell-script -*-
# Copyright: 2015, Nicholas Bamber <nicholas@periapt.co.uk>
_debdiff()
{
    local cur prev words cword _options i
	local _dir=normal
	local -i _from=-1
	local -i _to=-1
    _init_completion || return

    for (( i=1; i<${#words[@]}; i++ )); do
		if [[ $_dir == @(deb|dsc|changes) ]]; then
			if (( i == ${#words[@]}-1 )); then
				break
			else
				COMPREPLY=()
				return 0
			fi
		fi
		if (( ${_from} == -1  && ${_to} == -1 )); then
			_dir=normal
		elif (( ${_from} >= 0 && ${_to} == -1 )); then
			_dir=from
		elif (( ${_from} >= 0 && ${_to} >= 0 && ${_to} < ${_from} )); then
			_dir=to
		else
			COMPREPLY=( ) 
			return 0
		fi
		if [[ $_dir == normal && ${words[i]} == --from ]]; then
			_from=0
			_dir=from
		elif [[ $_dir == normal && ${words[i]} == *.deb ]]; then
			_dir=deb
		elif [[ $_dir == normal && ${words[i]} == *.dsc ]]; then
			_dir=dsc
		elif [[ $_dir == normal && ${words[i]} == *.changes ]]; then
			_dir=changes
		elif [[ $_dir == from && ${words[i]} == *.deb ]]; then
			(( ++_from ))
		elif [[ $_dir == from && ${words[i]} == --to ]]; then
			_to=0
			_dir=to
		elif [[ $_dir = to && ${words[i]} == *.deb ]]; then
			(( ++_to ))
		fi
    done

	if [[ $_dir == normal ]]; then

		if [[ $prev == --debs-dir ]]; then
			COMPREPLY=$( ( compgen -d -- "$cur" ) )
		elif [[ $cur == -* ]]; then
			_options='--from --dirs --nodirs --move --move-regex --nocontrol --control --controlfiles --wdiff-source-control --no-wdiff-source-control --wp --wl --wt --show-moved --noshow-moved --renamed --exclude --diffstat --no-diffstat --auto-ver-sort --no-auto-ver-sort --unpack-tarballs --no-unpack-tarballs --debs-dir --quiet --ignore-space'
	
			if [[ $prev == debdiff ]]; then
				_options+=' --no-conf'
			fi
	
			COMPREPLY=( $( compgen -W "${_options}" -- "$cur" ) )
		else
	        declare -a _compreply=( $( compgen -o filenames -G '*.@(deb|dsc|changes)' ) )
	        COMPREPLY=( $( compgen -W "${_compreply[*]}"  -- "$cur" ) )
		fi
	elif [[ $_dir == deb ]]; then
		declare -a _compreply=( $( compgen -o filenames -G '*.deb' ) )
        COMPREPLY=( $( compgen -W "${_compreply[*]}"  -- "$cur" ) )
	elif [[ $_dir = dsc ]]; then
		declare -a _compreply=( $( compgen -o filenames -G '*.dsc' ) )
        COMPREPLY=( $( compgen -W "${_compreply[*]}"  -- "$cur" ) )
	elif [[ $_dir = changes ]]; then
		declare -a _compreply=( $( compgen -o filenames -G '*.changes' ) )
        COMPREPLY=( $( compgen -W "${_compreply[*]}"  -- "$cur" ) )
	else
	    _options=$(find . -name '*.deb' | sed -e's!\.\/!!' |  paste -s -d' ')
		if [[ $_dir == from ]]; then
			if (( $_from > 0 )); then
				_options+=' --to'
			fi
		fi
		COMPREPLY=( $( compgen -W "${_options}" -- "$cur" ) )
	fi

    return 0
} &&
complete -F _debdiff debdiff
        
# ex: ts=4 sw=4 et filetype=sh