'test' utility behavior question.

[Oleksandr Gavenko <gavenkoa at gmail dot com>]

  $ /bin/test -d && echo ok
ok
  $ /bin/test -d '' && echo ok || echo must_be_error
must_be_error

POSIX require argument for -d, so behavior implementation
depend.

I can not check another 'test' implementation now.
For me  get error is more convenient,
because this not break this code if $dir not defined:

  if [ -d $dir ]; then
    do-good-job;
  else
    info-user-about-missing-dir;
  fi

To resolve upper code I rewrite condition in POSIX compatible form:

  [ -d "$dir" ]

--
Best regards!


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