which returns the pathnames of the files (or links) which would be executed in the current environment, had the filename (or filenames) been given as a command (or commands) in a strictly POSIX-conformant shell. It does this by searching thepathsin the PATH environment variable for executable files matching the names of the arguments. which does not follow symbolic links.
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which 語法
which -a [filename] ...
選項
-a
打印每個匹配文件名的所有匹配路徑名。
Exit Status
返回以下值，具體取決于發生了什么：
0
找到所有文件名，并且所有文件名都是可執行文件。
1
未找到一個或多個文件名，或不可執行。
2
指定了無效選項。
which -a [filename] ...
Options
-a
Print all matching pathnames of each matching filename.
Exit Status
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 例子
which sh
查找執行sh命令時將運行的文件的路徑名。在大多數系統上，這輸出：
/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:
which (查找可執行文件)
在類似Unix的操作系統上，which命令查找與給定命令關聯的可執行文件。
On Unix-like operating systems, the which command locates the executable file associated with a given command.
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1 which 運行系統環境
2 which 說明
3 which 語法
4 which 例子
which 運行系統環境
Linux
which 說明
它不遵循符號鏈接。
which does not follow symbolic links.
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which 語法
選項
Exit Status
返回以下值，具體取決于發生了什么：
Options
Exit Status
which returns the following value, depending on what occurred:
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which 例子
查找執行sh命令時將運行的文件的路徑名。在大多數系統上，這輸出：
Locates the pathname of the file which would be run if the sh command were executed. On most systems, this will output:
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其他命令行
whereis | write | wc | w | whatis | who | whoami | whois | wait | wall |