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# Attempt to change into the argument's parent directory; This is intended for
# use when you've got a file path in a variable, or in history, or in Alt+.,
# and want to quickly move to its containing directory. In the absence of an
# argument, this just shifts up a directory, i.e. `cd ..`
#
# Note this is equivalent to `ud 1`.
pd() {
# Check arguments; default to $PWD
if [ "$#" -gt 1 ] ; then
printf >&2 'pd(): Too many arguments\n'
return 2
fi
set -- "${1:-"$PWD"}"
# Make certain there are no trailing slashes to foul us up, and anchor path
# if relative
while : ; do
case $1 in
*/) set -- "${1%/}" ;;
/*) break ;;
*) set -- "$PWD"/"$1" ;;
esac
done
# Strip a path element
set -- "${1%/*}"
# Try to change into the determined directory, or root if empty
command cd -- "${1:-/}"
}
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