深入探索Shell交互与非标准特性
1. 光标移动命令
在Shell操作中，Esc f和Esc b是两个非常实用的光标移动命令。Esc f命令会将光标向前移动到当前单词的末尾，这里的单词是由字母、数字和下划线组成，由空格或标点符号分隔。而Esc b命令则会将光标向后移动到上一个单词的开头。
以下是一些示例：
$ mary had a little lambda_ Esc b $ mary had a little lambda $ mary had a little lambda Esc b $ mary had a little lambda $ mary had a little lambda Esc b $ mary had a little lambda $ mary had a little lambda Esc f $ mary had a_little lambda $ mary had a_little lambda Esc f $ mary had a little_lambda任何时候按下Enter键，当前行都会作为命令执行。例如：
$ mary had a little_lambda Hit Enter; enter command ksh: mary: not found2. 访问历史命令
Shell会保存最近输入的命令历史，我们可以使用emacs命令Ctrl + p和Ctrl + n
