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for Unix and Unix-like operating systems STREAMS Rc (Unix shell) Unix Expo Graph (Unix) Mpack (Unix) Tip (Unix utility) Print Services for UNIX Write (Unix) Strings (Unix) Su (Unix) SDF Public Access Unix System Mail (Unix) Strip (Unix) Man page Less (Unix) Sar (Unix) Crypt (Unix) Split (Unix) Sum (Unix) Type (Unix) At (command) Ptx (Unix) Disown (Unix) Touch (command) Tee (command) Mv (Unix) Spell (Unix) Pg (Unix) Hash (Unix) Fold (Unix) Cmp (Unix) Factor (Unix) Head (Unix) Ln (Unix) Link (Unix) Nl (Unix) Fc (Unix) Du (Unix) Ps (Unix) Command (Unix) Interactive Systems Corporation Expand (Unix) Speak (Unix) Tr (Un