Re: [kbuild-all] Re: [PATCH] gcov: fail build on gcov_info size mismatch

[Herbert Xu]

Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> See:
> 
>   [torvalds@ryzen ~]$ a="!" [ "$a" = ".size" ]
> 
> is fine, but
> 
>   [torvalds@ryzen ~]$ a="!" [ $a = ".size" ]
>   -bash: [: =: unary operator expected

This isn't doing what you think it's doing.  The first assignment
to a is not in effect when the shell is expanding $a so what you're
actually running is

	a="!" [ = .size ]

Which is why it bombs out.

To get the desired result you need a semicolon:

$ a="!"; [ $a = ".size" ]
$ 

Cheers,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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