Content-type: text/html
true, false - Returns a standard exit value
true
false
Interfaces documented on this reference page conform to industry standards as follows:
false: XPG4, XPG4-UNIX
true: XPG4, XPG4-UNIX
Refer to the
standards(5)
reference page for more information
about industry standards and associated tags.
The
true
command returns
a 0 (zero) exit value. The
false
command returns a nonzero
exit value. These commands are usually used in input to shell commands.
The special built-in utility
:
(colon) is sometimes
more efficient than the
true
command.
[Compaq] The nonzero value returned by the false command may vary from
system to system.
To construct a loop in a shell procedure, enter:
while true
do
date
sleep 60
done
This procedure displays the date and time once a minute. To stop it,
press the Interrupt key sequence.
Commands: csh(1), ksh(1), Bourne Shell sh(1b), POSIX shell sh(1p)
Standards: standards(5)