On Fri, 2021-03-19 at 07:24 -0400, Scott Andrews wrote:
> On Fri, 19 Mar 2021 07:09:06 +0100
> Pierre Labastie <pierre.labas...@neuf.fr> wrote:
>
> >
> > Using brackets depends on "something". If something is a predicate,
> > you need brackets. If something is a (compound) command, no
> > brackets. I've not looked in details at the "if" in the boot
> > scripts, but they must be correct in this respect, since they seem
> > to work...
> >
>
> By brackets are you talking about [ ] or [[ ]]?
>
> if [ something ]; then this; fi,
>
> Really means
>
> if test something; then this; fi
>
> [ is actually test, and the [ must be followed by ]
>
> [[ ]] is an expression
>
> See the gnu bash reference manual for clarification.
>
Here is an experiment:
---
pierre [ ~ ]$ toto () {
> return 1
> }
pierre [ ~ ]$ if toto; then echo true; else echo false; fi
false
pierre [ ~ ]$ if [ toto ]; then echo true; else echo false; fi
true
---
Pierre
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