which

EE 发表于 2020-08-24 17:14浏览次数：

在类似Unix的操作系统上，which命令查找与给定命令关联的可执行文件。

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1 which 运行系统环境

2 which 说明

3 which 语法

4 which 例子

Linux

返回将在当前环境中执行的文件（或链接）的路径名，如果文件名（或文件名s）在严格POSIX-符合的 shell 中作为命令（或命令）提供。它通过搜索 PATH 环境变量中的路径来搜索与参数名称匹配的可执行文件。
它不遵循符号链接。

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which -a [filename] ...

选项

-a	打印每个匹配文件名的所有匹配路径名。

返回以下值，具体取决于发生了什么：

which -a [filename] ...

-a	Print all matching pathnames of each matching filename.

which returns the following value, depending on what occurred:

0	All filenames were found, and all were executable.
1	One or more filenames were not found, or were not executable.
2	An invalid option was specified.

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which sh

查找执行sh命令时将运行的文件的路径名。在大多数系统上，这输出：

/bin/sh

which sh

Locates the pathname of the file which would be run if the sh command were executed. On most systems, this will output:

/bin/sh

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