
  Special Variables <a class="group-link" href="chap-special-var.html">special-var</a>


  [YSH Vars]      ARGV              X ENV                 X _ESCAPE
                  _this_dir
  [YSH Status]    _error
                  _pipeline_status    _process_sub_status
  [YSH Tracing]   SHX_indent          SHX_punct             SHX_pid_str
  [YSH read]      _reply
  [History]       YSH_HISTFILE
  [Oils VM]       OILS_VERSION
                  OILS_GC_THRESHOLD   OILS_GC_ON_EXIT
                  OILS_GC_STATS       OILS_GC_STATS_FD
                  LIB_YSH
  [Float]         NAN                 INFINITY
