library(unix)

This package provides a set of UNIX-like commands. They take character lists as well as atoms.

     | ?- cd.           % same as cd "~".
     | ?- cd Dir.       % Dir is atom or chars.
     
     | ?- csh.          % runs an interactive /bin/csh
     | ?- csh Cmd.      % interprets Cmd with /bin/csh
     | ?- ls.           % runs /bin/ls with no arguments.
     
     | ?- pg F.         % same as sh('/usr/bin/pg F').
     
     | ?- sh.           % runs an interactive /bin/sh
     | ?- sh Cmd.       % interprets Cmd with /bin/sh
     | ?- shell.        % runs an interactive $SHELL
     | ?- shell Cmd.    % interprets Cmd with $SHELL