false: Do nothing, unsuccessfully
false does nothing except return an exit status of 1, meaning
failure. It can be used as a place holder in shell scripts
where an unsuccessful command is needed.
In most modern shells,
false is a built-in command, so when
you use ‘false’ in a script, you’re probably using the built-in
command, not the one documented here.
false honors the --help and --version options.
This version of
false is implemented as a C program, and is thus
more secure and faster than a shell script implementation, and may safely
be used as a dummy shell for the purpose of disabling accounts.
false (unlike all other programs documented herein)
exits unsuccessfully, even when invoked with
--help or --version.
Portable programs should not assume that the exit status of
false is 1, as it is greater than 1 on some