NAME
true, false — return exit status zero or one respectively
DESCRIPTION
The command
true
does nothing, and returns exit code zero.
The command
false
does nothing, and returns exit code one.
They are typically used to construct command procedures.
RETURN VALUE
Exit values are:
- 0
always from
true.
- 1
always from
false.
EXAMPLES
This command loop repeats without end:
while true
do
command
done
WARNINGS
true
is typically used in shell scripts.
Some shells provide a built-in version of
true
(and
false)
that is more efficient than the standalone versions.
STANDARDS CONFORMANCE
true: SVID2, SVID3, XPG2, XPG3, XPG4, POSIX.2
false: SVID2, SVID3, XPG2, XPG3, XPG4, POSIX.2
