Permission mode 0 6 4 4 4+2=6 Read, Write 4 Read 4 Read Permission mode 0 7 5 5 4+2+1=7 Read, Write, eXecute 4+1=5 Read, eXecute 4+1=5 Read, eXecute More technically, this is an octal representation of a bit field – each bit references a separate permission, and grouping 3 bits at a time in octal corresponds to grouping these permissions by user, group, and others. each sum represents a specific set of permissions. These values never produce ambiguous combinations.
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