文章摘要
这篇文章介绍了 shell 命令 `type` 的语法和用法。`type` 命令用于显示变量的类型或文件的类型。其语法为 `type [-afptP] name [name ...]`，支持多个选项：
- `-t`：输出与 `NAME` 相关的类型信息（如 alias、keyword 等）。
- `-p`：显示可能执行的文件名或返回空值。
- `-a`：显示所有包含可执行文件的路径。
- `-f`：禁用函数查找。
- `-P`：强制搜索路径，即使 `NAME` 是 alias、builtin 或函数。
此外，文章还提到 `typeset` 命令已弃用，建议使用 `declare` 命令替代。
[root@new55 ~]#?type -a type?
type is a shell builtin
[root@new55 ~]#?help type?
type: type [-afptP] name [name …]
? For each NAME, indicate how it would be interpreted if used as a
? command name.
? If the -t option is used, `type’ outputs 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 unfound, respectively.
? If the -p flag is used, `type’ either returns the name of the disk
? file that would be executed, or nothing if `type -t NAME’ would not
? return `file’.
? If the -a flag is used, `type’ displays all of the places that contain
? an executable named `file’.? This includes aliases, builtins, and
? functions, if and only if the -p flag is not also used.
? The -f flag suppresses shell function lookup.
? The -P flag forces 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.
typeset: typeset [-afFirtx] [-p] name[=value] …
? Obsolete.? See `declare’.
[root@new55 ~]#
type is a shell builtin
[root@new55 ~]#?help type?
type: type [-afptP] name [name …]
? For each NAME, indicate how it would be interpreted if used as a
? command name.
? If the -t option is used, `type’ outputs 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 unfound, respectively.
? If the -p flag is used, `type’ either returns the name of the disk
? file that would be executed, or nothing if `type -t NAME’ would not
? return `file’.
? If the -a flag is used, `type’ displays all of the places that contain
? an executable named `file’.? This includes aliases, builtins, and
? functions, if and only if the -p flag is not also used.
? The -f flag suppresses shell function lookup.
? The -P flag forces 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.
typeset: typeset [-afFirtx] [-p] name[=value] …
? Obsolete.? See `declare’.
[root@new55 ~]#
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