Picking a random card from a deck

 #!/bin/bash
 # pick-card.sh

 # This is an example of choosing random elements of an array.

 # Pick a card, any card.

 Suites="Clubs Diamonds Hearts Spades"

 Denominations="2 3 4 5 6 7 8 9 10 Jack Queen King Ace"

 # Note variables spread over multiple lines.

 suite=($Suites)                # Read into array variable.
 denomination=($Denominations)

 num_suites=${#suite[*]}        # Count how many elements.
 num_denominations=${#denomination[*]}

 echo -n "${denomination[$((RANDOM%num_denominations))]} of "
 echo ${suite[$((RANDOM%num_suites))]}

 # $bozo sh pick-cards.sh
 # Jack of Clubs
 # Thank you, "jipe," for pointing out this use of $RANDOM.