#Bash 的 type 命令

type [-afptP] NAME...

功能

查看命令的类型。

类型

Bash 内置命令。

参数

• -a - 查看所有同名的命令类型
• -f - 忽略函数
• -P - 强制从 PATH 中搜索，即使参数是内置命令、别名或函数等
• -p - 仅当命令是文件时打印其路径，其它类型不打印
• -t - 仅打印类型名：
  • alias（别名）
  • keyword（关键字）
  • function（函数）
  • builtin（内置命令）
  • file（文件）
  • (空)（命令不存在）
• NAME - 要查询类型的命令列表

#示例

$ type ls
ls is aliased to `ls --color=auto'
$ type -a ls      # 查看所有 ls
ls is aliased to `ls --color=auto'
ls is /usr/bin/ls
ls is /bin/ls
$ type cd
cd is a shell builtin
$ type cat
cat is hashed (/usr/bin/cat)
$ type vim
vim is /usr/bin/vim

• ls 是 ls --color=auto 的别名
• cd 是 Bash 的内置命令
• cat 是可执行文件 /usr/bin/cat，并且已记录到哈希表
• vim 是可执行文件 /usr/bin/vim

#相关命令

#推荐阅读

• type(1p) — Linux manual page

#手册

显示
type: type [-afptP] name [name ...]
    Display information about command type.

    For each NAME, indicate how it would be interpreted if used as a
    command name.

    Options:
      -a	display all locations containing an executable named NAME;
    		includes aliases, builtins, and functions, if and only if
    		the `-p' option is not also used
      -f	suppress shell function lookup
      -P	force a PATH search for each NAME, even if it is an alias,
    		builtin, or function, and returns the name of the disk file
    		that would be executed
      -p	returns either the name of the disk file that would be executed,
    		or nothing if `type -t NAME' would not return `file'
      -t	output a single word which is one of `alias', `keyword',
    		`function', `builtin', `file' or `', if NAME is an alias,
    		shell reserved word, shell function, shell builtin, disk file,
    		or not found, respectively

    Arguments:
      NAME	Command name to be interpreted.

    Exit Status:
    Returns success if all of the NAMEs are found; fails if any are not found.