1.结构

  while condition
  do
        command
  done

例子：

  #!/bin/bash
  int=1
  while (($int<=5))
  do
        echo $int
        let "int++"
  done

2.无线循环的例子

  while :
  do
        command
  done

  while ture
  do
        command
  done

原文：https://www.cnblogs.com/huangdengtao/p/13149582.html