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Editor to share with you the use of linux hash command to display and clear the command runtime query hash table, I believe that most people do not know much, so share this article for you to learn, I hope you will learn a lot after reading this article, let's go to learn the method!

The hash command is responsible for displaying and clearing the hash table (hash table) that is queried first by the system when the command runs.

When the hash command does not specify parameters or flags, the hash command reports the contents of the pathname list to standard output. This report contains the pathname of the command in the current hash environment found by the previous shell command call. It also contains those commands that are called and found by the normal command search process.

Syntax format: hash [parameters] [directory]

Commonly used parameters: coach

-d clear records in hash table-l display commands in hash table-p add commands with full path to hash table-r clear records in hash table-t display full path of commands in hash table

Reference example

Display the commands in the hash table:

[root@linuxcool ~] # hash-l

Delete the command in the hash table:

[root@linuxcool ~] # hash-r

Add commands to the hash table:

[root@linuxcool] # hash-p / usr/sbin/adduser myadduser

Clear the record in the hash table:

[root@linuxcool ~] # hash-d

Displays the full path to the command in the hash table:

[root@linuxcool ~] # hash-t above is all the contents of the hash table queried by using the hash command in linux to display and clear the command run. Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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