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#!/bin/bash
#
# from: https://unix.stackexchange.com/questions/573047/how-to-get-the-relative-path-between-two-directories
#
# Expects two parameters, source-dir and target-dir, both absolute canonicalized
# non-empty pathnames, either may be /-ended, neither need exist.
# Returns result in shell variable $REPLY as a relative path from source-dir
# to target-dir without trailing /, . if void.
#
# Algorithm is from a 2005 comp.unix.shell posting which has now ascended to
# archive.org.
pnrelpath() {
set -- "${1%/}/" "${2%/}/" '' ## '/'-end to avoid mismatch
while [ "$1" ] && [ "$2" = "${2#"$1"}" ] ## reduce $1 to shared path
do set -- "${1%/?*/}/" "$2" "../$3" ## source/.. target ../relpath
done
REPLY="${3}${2#"$1"}" ## build result
# unless root chomp trailing '/', replace '' with '.'
[ "${REPLY#/}" ] && REPLY="${REPLY%/}" || REPLY="${REPLY:-.}"
}
pnrelpath "$1" "$2"
echo $REPLY
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