Set files to read only for UNIX based systems

FreeBSD, Mac OS X and other BSD unix user can use the chflags command:

## set read-only ##
chflags schg /path/to/file.php
 
# remove read-only ##
chflags noschg /path/to/file.php

to not set the entire directory as read only ( still allowing content to be put on the drive)
find . -exec chflags schg {} \;

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