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#!/bin/sh
# Given two pathnames, print the first relative to the second.
#
# Adapted from
# https://unix.stackexchange.com/questions/573047/how-to-get-the-relative-path-between-two-directories
usage() {
echo "usage: $0 source target" >&2
exit 1
}
check_abs() {
case "$1" in
/*)
;;
*)
echo "? not an absolute pathname: $1"
usage
;;
esac
}
[ $# = 2 ] || usage
check_abs "$1"
check_abs "$2"
source="$1"
target="$2"
prefix=""
source="`echo "$source" | sed -e 's%/$%%'`/"
target="`echo "$target" | sed -e 's%/$%%'`/"
remain=`echo "$source" | sed -e 's%^'$target'%%'`
while [ -n "$target" ] && [ "$source" = "$remain" ]
do
prefix="../$prefix"
target=`echo "$target" | sed -e 's%/[^/]*/$%/%'`
remain=`echo "$source" | sed -e 's%^'$target'%%'`
done
result="${prefix}${remain}"
[ -n "$result" ] || result="."
echo "$result"
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