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copied!<p>Here's a shell script that does it without calling other programs:</p> <pre class="lang-sh prettyprint-override"><code>#! /bin/env bash #bash script to find the relative path between two directories mydir=${0%/} mydir=${0%/*} creadlink="$mydir/creadlink" shopt -s extglob relpath_ () { path1=$("$creadlink" "$1") path2=$("$creadlink" "$2") orig1=$path1 path1=${path1%/}/ path2=${path2%/}/ while :; do if test ! "$path1"; then break fi part1=${path2#$path1} if test "${part1#/}" = "$part1"; then path1=${path1%/*} continue fi if test "${path2#$path1}" = "$path2"; then path1=${path1%/*} continue fi break done part1=$path1 path1=${orig1#$part1} depth=${path1//+([^\/])/..} path1=${path2#$path1} path1=${depth}${path2#$part1} path1=${path1##+(\/)} path1=${path1%/} if test ! "$path1"; then path1=. fi printf "$path1" } relpath_test () { res=$(relpath_ /path1/to/dir1 /path1/to/dir2 ) expected='../dir2' test_results "$res" "$expected" res=$(relpath_ / /path1/to/dir2 ) expected='path1/to/dir2' test_results "$res" "$expected" res=$(relpath_ /path1/to/dir2 / ) expected='../../..' test_results "$res" "$expected" res=$(relpath_ / / ) expected='.' test_results "$res" "$expected" res=$(relpath_ /path/to/dir2/dir3 /path/to/dir1/dir4/dir4a ) expected='../../dir1/dir4/dir4a' test_results "$res" "$expected" res=$(relpath_ /path/to/dir1/dir4/dir4a /path/to/dir2/dir3 ) expected='../../../dir2/dir3' test_results "$res" "$expected" #res=$(relpath_ . /path/to/dir2/dir3 ) #expected='../../../dir2/dir3' #test_results "$res" "$expected" } test_results () { if test ! "$1" = "$2"; then printf 'failed!\nresult:\nX%sX\nexpected:\nX%sX\n\n' "$@" fi } #relpath_test </code></pre> <p>source: <a href="http://www.ynform.org/w/Pub/Relpath" rel="nofollow noreferrer">http://www.ynform.org/w/Pub/Relpath</a></p>

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