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type
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===
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显示指定命令的类型
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## 补充说明
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**type命令** 用来显示指定命令的类型，判断给出的指令是内部指令还是外部指令。
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命令类型：
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* alias：别名。
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* keyword：关键字，Shell保留字。
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* function：函数，Shell函数。
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* builtin：内建命令，Shell内建命令。
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* file：文件，磁盘文件，外部命令。
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* unfound：没有找到。
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### 语法
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```
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type(选项)(参数)
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```
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### 选项
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```
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-t：输出“file”、“alias”或者“builtin”，分别表示给定的指令为“外部指令”、“命令别名”或者“内部指令”；
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-p：如果给出的指令为外部指令，则显示其绝对路径；
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-a：在环境变量“PATH”指定的路径中，显示给定指令的信息，包括命令别名。
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```
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### 参数
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指令：要显示类型的指令。
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### 实例
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```
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[root@localhost ~]# type ls
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ls is aliased to `ls --color=tty'
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[root@localhost ~]# type cd
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cd is a shell builtin
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[root@localhost ~]# type date
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date is /bin/date
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[root@localhost ~]# type mysql
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mysql is /usr/bin/mysql
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[root@localhost ~]# type nginx
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-bash: type: nginx: not found
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[root@localhost ~]# type if
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if is a shell keyword
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[root@localhost ~]# type which
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which is aliased to `alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
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[root@localhost ~]# type -a cd
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cd is a shell builtin
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[root@localhost ~]# type -a grep
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grep is /bin/grep
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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