`true': Do nothing, successfully ================================ `true' does nothing except return an exit status of 0, meaning "success". It can be used as a place holder in shell scripts where a successful command is needed, although the shell built-in command `:' (colon) may do the same thing faster. In most modern shells, `true' is built-in command, so when you use `true' in a script, you're probably using the built-in command, not the one documented here. By default, `true' honors the `--help' and `--version' options. However, that is contrary to POSIX, so when the environment variable `POSIXLY_CORRECT' is set, `true' ignores _all_ command line arguments, including `--help' and `--version'. `true' ignores _all_ command line arguments, even `--help' and `--version', since to do otherwise would change expected behavior that some programmers may be relying on. This version of `true' 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.
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