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GNU cfengine

3.8.36 NonAlphaNumFiles

If enabled, this option causes cfengine to detect and disable files which have purely non-alphanumeric filenames, i.e. files which might be accidental or deliberately concealed. The files are then marked with a suffix .cf-nonalpha and are rendered visible.

NonAlphaNumFiles = ( on )

These files can then be tidied by searching for the suffix. Note that alphanumeric means ascii codes less than 32 and greater than 126.