Setting modes on directories vs. data files is sometimes a pain in unix, especially if you're doing something like "enable group write access" on a directory tree and its files, and the files are all data
Not particularly if you RTFM, provided you don't want to set completely different modes for files vs directories.
chmod -R a=rX,ug+w foo/
Note the uppercase X mode which means "execute bit but only if it's a directory".
Makeshifts last the longest.
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