Christmas song for UNIX hackers:

better !pout !cry
better watchout
lpr why
santa claus < north pole > town

cat /etc/passed > list
ncheck list
ncheck list
cat list | grep naughty > nogiftlist
cat list | grep nice > giftlist
santa claus < north pole > town

who | grep sleeping
who | grep awake
who | egrep 'bad|good'
for (goodness sake) {
be good
}

(By Frank Carey, AT&T Bell Laboratories, 1985 )