Prints a random line from the bridge of Metallica's "Master of Puppets" when checking out the master branch.

post-checkout

#!/bin/sh
# .git/hooks/post-checkout
# chmod +x .git/hooks/post-checkout

if [ $(git symbolic-ref HEAD | cut -d '/' -f 3) == 'master' ]; then
    lines[0]="Master, Master, where's the dreams that I've been after?"
    lines[1]="Master, Master, you promised only lies"
    lines[2]="Laughter, laughter, all I hear or see is laughter"
    lines[3]="Laughter, laughter, laughing at my cries"
    echo "  ${lines[$((RANDOM%${#lines[*]}))]}";
fi

sed -e 's/^ //' | sed -e 's/ /-/g' can become sed -e 's/^ //' -e 's/ /-/g'

yay!