anchor.diff:  
   ls(Dir) -> apply(c, ls, Dir).
   
  +%% clear() -> ok.
  +
  +clear() -> io:format("\e[H\e[J").
  +
   %% m([Modules]) -> ok.
   %%  Print module information.
   
  
positive.code:           {i,1,[lambda,[ps],[':',lfe_shell,i,ps]]},
            %% {m,0,[lambda,[],[':',lfe_shell,m]]},
            %% {m,1,[lambda,[ms],[':',lfe_shell,m,ms]]},
            {pid,3,[lambda,[i,j,k],[':',lfe_shell,pid,i,j,k]]},
            {p,1,[lambda,[e],[':',lfe_shell,p,e]]},
            {pp,1,[lambda,[e],[':',lfe_shell,pp,e]]},
            {pwd,0,[lambda,[],[':',lfe_shell,pwd]]},
            {q,0,[lambda,[],[':',lfe_shell,exit]]},
            {regs,0,[lambda,[],[':',lfe_shell,regs]]},
            {exit,0,[lambda,[],[':',lfe_shell,exit]]}
           ],
  
negative.code: 
  q() -> c:q().
  
  %% flush() -> ok.
  
  flush() -> c:flush().
  
  %% regs() -> ok.
  
  regs() -> c:regs().
  