8:51 p.m.
Linus Torvalds <torvalds(a)linux-foundation.org> 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(a)gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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