shell脚本的 -P

-P项在这个shell脚本中用于read命令。当使用-P选项时，read命令会显示一个提示符，并将用户的输入存储到指定的变量中。在这个猜数游戏的脚本中，使用-P选项来显示"开始/退出（y/n）："的提示，并将用户的输入存储到变量x中。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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