The usage of which command in linux
This article mainly explains "the usage of which command in linux". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn the usage of the which command in linux.
1. Command format:
Which executable name
2. Command function:
The which instruction 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 of all files.
The-p parameter is the same as the-n parameter, but here the path to the file is included.
-w specifies the width of the field on output.
-V displays version information
4. Use an example:
Example 1: find files and display command paths
Command:
Which lsmod
Output:
The code is as follows:
[root@localhost ~] # which pwd
/ bin/pwd
[root@localhost ~] # which adduser
/ usr/sbin/adduser
[root@localhost ~] #
Description:
Which searches for runnable files according to the directories in the PATH variables configured by the user! Therefore, the commands found in different PATH configurations are of course different!
Example 2: use which to find out which
Command:
Which which
Output:
The code is as follows:
[root@localhost ~] # which which
Alias which='alias | / usr/bin/which-tty-only-read-alias-show-dot-show-tilde'
/ usr/bin/which
[root@localhost ~] #
Description:
Unexpectedly, there will be two which, one of which is alias, which is the so-called "command alias", which means that typing which will be equal to the following string of commands!
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