From LQWiki

The word true can mean several things:

1. Plain english: according to fact
2. The true command
3. Any value of a condition that is treated as true
   1. for most shells that would be a zero exit status of a command.
   2. for C language programs and some others, that would be any non-zero value.
4. For Java language programs and some others, this is a keyword of type boolean.

See also

false

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