Post Checkout git hook to remind me about running certain commands when appropriate files have been modified

post-checkout

#!/bin/sh
if git diff-tree --name-only --no-color -r -m $1 $2 | fgrep -e 'Gemfile' >/dev/null 2>&1
then
  echo "\nGemfile modified: run \`bundle install\`\n"
fi

if git diff-tree --name-only --no-color -r -m $1 $2 | fgrep -e 'db/migrate' -e 'db/schema.rb' -e 'db/structure.sql' >/dev/null 2>&1
then
  echo "\nSchema modified: run \'rake db:migrate\'\n"
fi