Summary of using the exclamation mark command (!) in Linux

Preface

Recently, our company has configured mbp, and I use ssh more often. I am too lazy to write those complicated commands, so I searched for a command on the Internet and found it is more suitable for me.

The '!' symbol can not only be used as a negation symbol in Linux, but can also be used to retrieve commands from the historical command record or execute previously run commands without modification.

The following article will give you a detailed introduction on how to use the Linux exclamation mark command (!). Let's take a look at the detailed introduction.

Exclamation mark command usage

Double exclamation mark!!

! ! Represents the last command entered, which can be combined with other commands to form a new command

eg:
 $ ./startup.sh
 $ cat !!

This command is equivalent to cat ./startup.sh, eliminating the need to switch back and forth

!$

Represents the last parameter in the previous command

eg:
 $ ls /usr/local/dic
 $ cat !$/a.txt

If the previous path is a long one, it will be very convenient.

!string

Represents the most recent command that begins with the specified string

eg:
 $ !ssh

Execute the most recent ssh command

!? string?

Similar to MySQL's fuzzy matching, execute the command containing the specified string in the most recent command

eg:
 $ !?ssh?

Execute the most recent command involving ssh

!n or !-n

This command is usually used with the history command.

Use history to find ssh records

eg:
 $ !109

Execute history to query the command with the previous sequence number 109

 $ !-1

Execute the command corresponding to the number obtained by subtracting 1 from the current command number

I just changed jobs recently and I'm quite busy, so the updates are quite slow.

Summarize

The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. If you have any questions, you can leave a message to communicate. Thank you for your support for 123WORDPRESS.COM.