Created
June 27, 2022 18:12
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Ways of checking if a file is "a symlink" and is "broken".
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| #!/bin/sh | |
| set -eu | |
| tempdir='' | |
| setup() { | |
| tempdir="$(mktemp -d)" | |
| cd "$tempdir" | |
| touch target | |
| ln -nsf target good | |
| ln -nsf nosuch bad | |
| ln -nsf good goodgood | |
| ln -nsf bad badgood | |
| } | |
| teardown() { | |
| if [ -d "$tempdir" ]; then | |
| rm -rf "$tempdir" | |
| fi | |
| } | |
| check() { | |
| printf "%s is " "${1}" | |
| eval "tput bold; if ${1}; then tput setaf 6; echo true; else tput setaf 1; echo false; fi; tput sgr0" | |
| } | |
| run() { | |
| echo POSIX | |
| for f in *; do | |
| check "[ -h $f ]" | |
| check "[ -L $f ]" | |
| check "[ -e $f ]" | |
| check "[ -f $f ]" | |
| done | |
| echo NON-POSIX | |
| for f in *; do | |
| check "[[ -h $f ]]" | |
| check "[[ -L $f ]]" | |
| check "[[ -a $f ]]" | |
| check "[[ -e $f ]]" | |
| check "[[ -f $f ]]" | |
| done | |
| echo OTHER TOOLS | |
| for f in *; do | |
| # check "find $f -type l \! -exec test -e {} \; -print" | |
| check "[ -z \"\$(find -L $f -type l)\" ]" | |
| check "[ -z \"\$(gfind -L $f -type l)\" ]" | |
| done | |
| } | |
| ## Main ## | |
| setup | |
| trap teardown EXIT | |
| run | |
| ## EOF ## |
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