File: coreutils.info, Node: true invocation, Next: test invocation, Prev: false invocation, Up: Conditions 16.2 '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 a built-in command, so when you use 'true' in a script, you're probably using the built-in command, not the one documented here. 'true' honors the '--help' and '--version' options. Note, however, that it is possible to cause 'true' to exit with nonzero status: with the '--help' or '--version' option, and with standard output already closed or redirected to a file that evokes an I/O error. For example, using a Bourne-compatible shell: $ ./true --version >&- ./true: write error: Bad file number $ ./true --version > /dev/full ./true: write error: No space left on device 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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