How to "find" all writable files in a directory tree?

Fri May 9 20:53:00 GMT 2003

I need to find all the files in a directory tree that are writable. So,
the "find" man page has the following text:
-------------------------
 -perm mode
 File's permission bits are exactly mode (octal or
symbolic).
 Symbolic modes use mode 0 as a point of departure.
 -perm -mode
 All of the permission bits mode are set for the file.
 -perm +mode
 Any of the permission bits mode are set for the file.
-------------------------
I'm not quite sure what this tells me. I guessed that "-perm +w" would
do what I want. Unfortunately, when I use this it says:
 find: invalid mode `+w'
I'm on Cygwin 1.3.22.
Am I misunderstanding what this man page says?
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