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What is /bin/true?


What is /bin/true on a Linux system? What is the purpose of it?

Asked by Hulk

Solution #1

A command that returns 0 is /bin/true (a truth value in the shell).

Its purpose is to be used in shell scripts when you would ordinarily use a literal like “true” in a programming language, but the shell will only execute a command.

The reverse, /bin/false, returns a non-zero value (a false value in the shell).

Answered by camh

Solution #2

The following is taken from the man page:

true - do nothing, successfully

true returns a status 0.

Answered by user231967

Solution #3

It’s worth noting that it’s not merely amusing or visually appealing. It can be used to quit a program without triggering the end handlers, which can cause problems when multi-threading or forked applications are used. In Perl, for example:

#!/usr/bin/env perl

exec "/bin/true";

  print "This wont get printed .. would have if I just 'exit' or 'die'\n";

Answered by user3072567

Solution #4

It’s been used to deceive a system into thinking a command has ran when it hasn’t. If a command fails, such as looping, a symlink to ‘true’ can be used to get the master task to start. Only if the position being replaced isn’t critical.

Answered by Sunshine

Solution #5

Simply put, it’s a program that returns 0. This value is sometimes required to make the script more understandable. When you need to utilize a command for a true value, this is the method to employ.

Answered by Marcus Thornton

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