anchor.diff:  %% regs() -> ok.
   
   regs() -> c:regs().
  +
  +%% exit() -> ok.
  +
  +exit() -> c:q().
  +
  
positive.code:          run_script/2,run_script/3,run_string/2,run_string/3]).
  
  %% The shell commands which generally callable.
  -export([c/1,c/2,ec/1,ec/2,i/0,i/1,l/1,m/0,m/1,pid/3,p/1,pp/1,regs/0]).
  
  -import(lfe_env, [new/0,add_env/2,
                    add_vbinding/3,add_vbindings/2,is_vbound/2,get_vbinding/2,
  
negative.code:           {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]]},
            {regs,0,[lambda,[],[':',lfe_shell,regs]]},
            {exit,0,[lambda,[],[':',lfe_shell,exit]]}
           ],
      Add = fun ({N,Ar,Def}, E) ->
                    lfe_eval:add_dynamic_func(N, Ar, Def, E)
  