Unix in a Nutshell, 4th Edition

Name

false

Synopsis

    false

A do-nothing command that returns an unsuccessful (nonzero) exit status. Normally used in Bourne shell scripts. See also true.

false is built into most modern shells.

Examples

# This loop never executes
    while false
    do
            commands
    done

    # This loop executes forever
    until false
    do
            commands
    done