The more you work with linux terminals, the more you end up needing to optimize your recurring tasks, looking for commands that optimize your day-to-day and improve your productivity: The command history it sure is one of them. As the name already gives, the command history lists all the command history of your terminal (the same history can be found in the file .bash_history in your folder home ). By default, the command history displays the last 5k saved commands.

Also check: How to Scan Your Linux Server for Malwares (Debian/Ubuntu)

Using the basic history command

just type history in the linux terminal to use the simplest mode of the command:

$history

# Result
1 clear
2 ls her
3 sudo apt-get update
4 history

The command history will display the command history of your session, at the beginning of each line there is a number, we can use this numbering to retrieve and re-execute the desired command:

$!2

# Result
drwxr-xr-x 2 shadowlik shadowlik 4096 Dec 28 17:40 Desktop
drwxr-xr-x 2 shadowlik shadowlik 4096 Dec 28 17:40 Documents
drwxr-xr-x 6 shadowlik shadowlik 4096 Jan 6 23:26 Downloads

There is another way to find and rerun commands by doing a generic search on the command history :

$!ls

You can also rerun your last command by typing !! .

Searching for a command using history

Now let's combine the command history with the command grep , so we'll be able to filter our history in search of the desired command:

$history | grep ls

# Result
2 sudo ls her
5 history | grep ls

Another way to access the search functionality is via the shortcut Ctrl-R . Type what you are looking for and your prompt will bring up the result:

(reverse-i-search)`':

Changing an executed command

We often want to find a command to rerun, but changing some option or parameter. The command history allows you to rerun commands with a different syntax. For example, if we want to change our previous command history | grep ls her for history | grep ls -ln , I can run the following command:

$^ls^ln^

THE history will rerun the command by swapping ls per ln .

Deleting the history

You may someday need to delete a command that contains some sensitive data or even all the commands in your history. To delete a particular command, type history -d <line#> and to erase the entire history content, type history -c .

0 0 votos
Nota do Artigo
Subscribe
Notify of
guest
0 Comentários
Inline Feedbacks
View all comments
0
Would love your thoughts, please comment.x
()
x