Just use 
if( not -w $dir) {
    die "directory $dir not writeable.\n";
}

[download]
The test -w works for files and directories. See perlfunc, -X (file tests). 
_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re: Checking for directory write permissions by shmem
in thread Checking for directory write permissions by sara2005

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