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1 | #!/bin/bash | |||
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2 | # both $1 and $2 are absolute paths (biginning with /) | |||
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3 | # returns $2 relative to $1 | |||
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4 | ||||
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5 | source=$1 | |||
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6 | target=$2 | |||
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7 | ||||
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8 | common_part=$source # for now | |||
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9 | result="" # for now | |||
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10 | ||||
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11 | while [[ "${target#$common_part}" == "${target}" ]]; do | |||
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12 | # no match, means that candidate common part is not correct | |||
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13 | # go up one level (reduce common part) | |||
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14 | common_part="$(dirname $common_part)" | |||
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15 | # and record that we went back, with correct / handling | |||
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16 | if [[ -z $result ]]; then | |||
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17 | result=".." | |||
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18 | else | |||
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19 | result="../$result" | |||
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20 | fi | |||
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21 | done | |||
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22 | ||||
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23 | if [[ $common_part == "/" ]]; then | |||
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24 | # special case for root (no common path) | |||
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25 | result="$result/" | |||
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26 | fi | |||
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27 | ||||
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28 | # since we now have identified the common part, | |||
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29 | # compute the non-common part | |||
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30 | forward_part="${target#$common_part}" | |||
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31 | ||||
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32 | # and now stick all parts together | |||
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33 | if [[ -n $result ]] && [[ -n $forward_part ]]; then | |||
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34 | result="$result$forward_part" | |||
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35 | elif [[ -n $forward_part ]]; then | |||
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36 | # extra slash removal | |||
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37 | result="${forward_part:1}" | |||
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38 | fi | |||
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39 | ||||
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40 | echo $result | |||
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