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Merge branch 'master' of https://github.com/jaywcjlove/linux-command

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jaywcjlove 2017-08-24 00:04:02 +08:00
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command/which.md
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@ -36,10 +36,16 @@ which(选项)(参数)
[root@localhost ~]# which adduser [root@localhost ~]# which adduser
/usr/sbin/adduser /usr/sbin/adduser
``` ```
说明：which是根据使用者所配置的 PATH 变量内的目录去搜寻可运行档的！所以，不同的 PATH 配置内容所找到的命令当然不一样的！ 说明：which是根据使用者所配置的 PATH 变量内的目录去搜寻可运行档的！所以，不同的 PATH 配置内容所找到的命令当然不一样的！
用 which 去找出 cd
```
[root@localhost ~]# which cd
cd: shell built-in command
```
cd 这个常用的命令竟然找不到啊！为什么呢？这是因为 cd 是bash 内建的命令！ 但是 which 默认是找 PATH 内所规范的目录，所以当然一定找不到的！
<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ --> <!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->