A git pre-commit hook to not permit commits with files larger than 100MB

pre-commit

#!/bin/sh
#
# Github won't permit files larger than 100MB (https://help.github.com/articles/working-with-large-files);
# don't wait to realize this until you try to push a bunch of commits.

git diff --cached --name-only |
  while read file
  do
    if [ $(du -m $file |cut -f 1) -ge 100 ]
    then
      echo Files too big: $file and maybe others
      exit 1
    fi
  done

# Don't add any other commands here. The 'exit' above will only exit the
# pipeline, and the exit status of the entire script is the exit status of the
# final command. I hate sh/bash.