Summary of Common Linux commands (i) which

Recently learned the knowledge of Linux Foundation, so the common Linux commands are explained and summarized; (One day)

(CentOS 7.0 version)

We often look for a file, but we can't find the file, we can use the which command to find the file

The purpose of the which command is to search for the location of a system command in the path specified by the path variable, and return the first search result. That is, with the which command, you can see whether a system command exists, and the command that executes exactly which location.

Whitch

1. command format:

which executable file name

2. Command function:

which command will searches for the location of a system command in the path specified by the path variable, and returns the first search result .

3. Command parameters:

-n Specifies the length of the file name, which must be greater than or equal to the longest file name in all files.

-P is the same as the-n parameter, but the path to the file is included here.

-W Specifies the width of the field at the output.

-V Display version information

4. usage Examples:

Example 1: Finding files, displaying command paths

[email protected] ~]# which alias

/usr/bin/alias

Description

1.which is based on the user's configured directory within the PATH variable to search for a running file! Therefore, the different path configuration content found the command of course not the same!

2.which cannot find the built-in commands for bash, such as a CD command not found

Summary of Common Linux commands (i) which