'test' utility behavior question.

[Oleksandr Gavenko]

On 2010-08-30 20:31, Eric Blake wrote:
> On 08/30/2010 11:27 AM, Oleksandr Gavenko wrote:
>> $ /bin/test -d && echo ok
>> ok
>> $ /bin/test -d '' && echo ok || echo must_be_error
>> must_be_error
>
> Both of these results match POSIX. Remember, POSIX describes different
> behaviors for one argument than for two arguments (for the one-argument
> case, the string "-d" is non-empty, so the result must be 0; for the
> two-argument case, the string "-d" is a unary operator, and there is no
> directory named '').
>
>> if [ -d $dir ]; then
>
> The bug is in your script. You forgot to use quoting or a bashism.
> Either of these fixes will correct your script (although the latter
> requires bash):
>
> if [ -d "$dir" ]; then
>
> if [[ -d $dir ]]; then
>
> This is not cygwin-specific.
>
You right!

Sorry, I miss this when read POSIX:

1 argument:
Exit true (0) if $1 is not null; otherwise, exit false.

-- 
Best regards!


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