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       vt-is-UTF8  -  check  whether  current  VT  is  in  UTF8- or byte-mode.

       vt-is-UTF8 [-h|--help] [-V|--version] [-q|--quiet]

       vt-is-UTF8 checks whether the current VT is in UTF8  mode,  by  writing
       (and  erasing  afterwards) a 3-byte-long UTF8 sequence, and looking how
       much  chars  where  displayed  by  the  console   driver.    vt-is-UTF8
       检查当前VT是否处于  UTF8  模式,  其方式是写(并且随后擦除) 一个 3 字节的
       UTF8 序列, 然后察看控制台驱动展示了多少个字符.

       A message telling in which mode the  console  is  is  then  written  to
       stdout     (except     if    the    --quiet    option    was    given).
       然后会在标准输出上给出一个信息,  指出控制台所用模式(除非给出了  --quiet

       If the --quiet option is not given, the value returned is 1 if an error
       occurs, else 0.  在有错误发生时, 如果没有选取 --quiet 选项,  返回值将是
       1 , 否则将是 0 .

       -h --help
              display   version   number,  a  short  help  message  and  exit.
              展示版本号, 以及一个简短的帮助信息, 然后退出.

       -V --version
              display version number and exit.  展示版本号然后退出.

       -q --quiet
              do not print on stdout in with mode we are, but return the state
              as  exit-status 1 if in UTF8-mode, 0 if in byte-mode. In case of
              error, 0 is returned and  a  message  is  displayed  on  stderr.
              不在标准输出上打印所处模式,    但是返回一个状态,    对于    UTF8
              模式该退出状态为 1 , 而对于字节模式该状态为  0  .  如果发生错误,
              也返回 0 , 并且送给标准错误一个信息.


       The  check  should  be done by directly asking the kernel, which is not
       possible           as           of            kernels            2.0.x.
       模式的检查可能应该通过直接请求内核来进行,         但从内核        2.0.x

       As of kernel 2.0.35, the byte-mode is sometimes erroneously detected as
       UTF8-mode,  after  switching from a 512-chars font to a 256-chars font.
       This is probably a console-driver bug.  从 2.0.35 的内核开始,  在做了从
       512  字符字体到 256 字符字体的切换后, 字节模式有时会被错误地认为是 UTF8
       模式. 这或许就是一个控制台驱动的 bug .

       unicode_start(1), unicode_stop(1).