Uh-huh.
Just tried "false && echo wee" in my terminal, then "true && echo wee". Learn something new every day.
this post was submitted on 21 Feb 2025
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not to be consufes with:
true: Do nothing, successfully
And also not to be confused with:
: : Do nothing
If you ever feel useless, don't forget that both true and false have manpages in Linux.
They even have --help and --version flags in case you need them.
Huh, TIL
~ $ /bin/true --help
Usage: /bin/true [ignored command line arguments]
or: /bin/true OPTION
Exit with a status code indicating success.
--help display this help and exit
--version output version information and exit
NOTE: your shell may have its own version of true, which usually supersedes
the version described here. Please refer to your shell's documentation
for details about the options it supports.
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Full documentation <https://www.gnu.org/software/coreutils/true>
or available locally via: info '(coreutils) true invocation'
I honestly don't know what I prefer more, the overengineered GNU true, or the true that shipped with some older system that was literally just an empty file with the executable bit set.
This version of 'false' is implemented as a C program, and is thus more secure and faster than a shell script implementation
I bet there is a way to exploit
int main(int, char**) {
return 1;
}
If you run it on a machine with 0-bit integers, it will cause an overflow