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Re: bash test -n && test -z return tru
- From: Christopher Faylor <cgf-no-personal-reply-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Fri, 19 Aug 2005 15:12:35 -0400
- Subject: Re: bash test -n && test -z return tru
- References: <43062C7F.8010906@pooryorick.com>
- Reply-to: cygwin at cygwin dot com
On Fri, Aug 19, 2005 at 03:01:19PM -0400, Poor Yorick wrote:
>from reading the bash man pages, I would have thought the -n and -z were
>mutually exclusive. Therefore I don't understand this result:
>
>~>$ [ -n $(which nonexisingfilename 2>/dev/null) ] && [ -z $(which
>nonexistingfilename 2&>/dev/null) ] && echo hello
>hello
>~>$
>
>can anyone help explain this?
This defaults to
[ -n ] && [ -z ] && echo hello
I would have expected a syntax error in that case.
Regardless of that, however, if you want to actually make this work you
need to do something like:
[ -n "$(which nonexisingfilename 2>/dev/null)" ]
cgf
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