As others said before 775 is also executable. If I want to make everything in my dir "rw" for me and my group and "r" for everyone else and all subdirectories "x" I don't use perl but 2 chmod-s with find and xargs: 
find /my/dir -type d | xargs chmod 775
find /my/dir -type f | xargs chmod 664

[download]
Update: changed type 7 to type f

In reply to Re: chmod 775 on all files by Skeeve
in thread chmod 775 on all files by Anonymous Monk

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