====
/usr/local/bin/nstools: {action}
  h: help
  a: action
  m: mnt file
  n: net file
  f: file path
  i: read script from stdin - run action
  b: binary, base64 output, read the whole file - get action
  s: start position(Mega byte),-1 is the last byte, default=0.only apply to text file - get action
  l: Mega byte to read, default=0.only apply to text, if 0, read all text file - get action