Until loops

General

• here the loop continues until the condition becomes true, not while the condition is true
• It's good for continuing to loop until something happens

Syntax

until condition
do
  statements
done

Examples

• Loop until bpillet logs in, and when he does ring the bell

until who | grep "$1" > /dev/null
do
  sleep 60
done

echo -e \\a
echo "*** $1 has just logged in ***"