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# Shortcut to step up the directory tree with an arbitrary number of steps,
# like cd .., cd ../.., etc
ud() {
# For completeness' sake, we'll pass any options to cd
local arg
local -a opts
for arg ; do
case $arg in
--)
shift
break
;;
-*)
shift
opts[${#opts[@]}]=$arg
;;
*)
break
;;
esac
done
# Check and save optional first argument, number of steps upward; default
# to 1 if absent
local -i steps
steps=${1:-1}
if ! ((steps > 0)) ; then
printf 'bash: %s: Invalid step count %s\n' "$FUNCNAME" "$1" >&2
return 2
fi
# Check and save optional second argument, target directory; default to
# $PWD (typical usage case)
local dirname
dirname=${2:-$PWD}
if [[ ! -e $dirname ]] ; then
printf 'bash: %s: Target directory %s does not exist\n' "$FUNCNAME" "$2" >&2
return 1
fi
# Append /.. to the target the specified number of times
local -i i
for (( i = 0 ; i < steps ; i++ )) ; do
dirname=${dirname%/}/..
done
# Try to change into it
cd "${opts[@]}" -- "$dirname"
}
# Completion setup for ud
_ud() {
# Only makes sense for the second argument
((COMP_CWORD == 2)) || return 1
# Iterate through directories, null-separated, add them to completions
local dirname
while IFS= read -d '' -r dirname ; do
COMPREPLY[${#COMPREPLY[@]}]=$dirname
done < <(
# Set options to glob correctly
shopt -s dotglob nullglob
# Collect directory names, strip trailing slashes
local -a dirnames
dirnames=("${COMP_WORDS[COMP_CWORD]}"*/)
dirnames=("${dirnames[@]%/}")
# Bail if no results to prevent empty output
((${#dirnames[@]})) || exit 1
# Print results null-delimited
printf '%s\0' "${dirnames[@]}"
)
}
complete -F _ud -o filenames ud
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