!!!参考
https://qiita.com/soramugi/items/ab82f30a5906851472cc

!!!bash
  #!/bin/bash
  
  echo '
  256色
  前: 38;05;色番号
  背: 48;05;色番号
  '
  for i in {0..255} ; do
    printf "\x1b[38;05;${i}m 38;05;${i} "
  done
  echo ''
  for i in {0..255} ; do
    printf "\x1b[48;05;${i}m 48;05;${i} "
  done
  echo ''
{{category2 OS,Linux}}