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