Homebrew relink if necessary

a.sh

#!/bin/bash

for keg in /usr/local/Library/LinkedKegs/*; do
  kegname="$(basename $keg)"
  dir="$(find $keg/ -maxdepth 1 -type d | grep '\/\(sbin\|bin\|etc\|var\|lib\|include\|libexec\|share\)$' | head -n1)"
  [ -z "${dir}" ] && continue
  testee="$(find $dir -type f | head -n1 | sed -e "s|${keg}||")"
  [ -f /usr/local/$testee ] || (echo $keg && brew unlink $kegname; brew link --force $kegname)
done