The -w test will do: 
if (-w FILEHANDLE) {
    print "It's writeable by my effective uid or gid!\n";
}

[download]
For more information, see -X (or perldoc -f -X).

In reply to Re: How do I test whether or not a file is writable? by chromatic
in thread How do I test whether or not a file is writable? by Anonymous Monk

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