TRUE(1) — Unix Programmer’s Manual
NAME
true, false − provide truth values
SYNOPSIS
true
false
DESCRIPTION
True and false are usually used in a Bourne shell script. They test for the appropriate status "true" or "false" before running (or failing to run) a list of commands.
EXAMPLE
while true
do
command list
done
SEE ALSO
DIAGNOSTICS
True has exit status zero.
7th Edition — April 29, 1985