How to Utilise History Command on Linux – Guide
The history command is a helpful tool for Linux server administrators. It allows you to view a list of commands that have been previously executed, search the list, and manipulate the history file. This feature can make your day-to-day tasks easier and improve your productivity. ..
GNU history is a powerful command that allows you to reproduce or reuse commands from a previous terminal session. This can be helpful for new system administrators or for seasoned terminal users who want to save time. ..
type “history” This is not a command. It’s just a prompt from the shell. Second, you can’t use the history command to go back in time. The shell keeps track of your commands as you type them, and it can show you the results of those commands even if you’ve already executed them. To go back in time, you need to use the command line interface (CLI) or a different program. ..
Your computer cannot find the history command because it is an internal keyword of your shell. As it is written in the shell, there may be some variation in how the history behaves depending on whether you are using Bash, tcsh, Zsh, dash, fish, ksh and so on. This article is based on the Bash history implementation, so some functions may not work in other shells. However, most of the basic functions are the same.
Story 101
sudo apt-get update sudo apt-get install linux-headers-$(uname -r) linux-image-$(uname -r)
The answer I received was: “I don’t know.”
history -h This will show you a list of all the commands that have been entered since you started the session. You can use any of them by typing them into a text editor and pressing the spacebar.
!3 This tells the shell to rerun the command on line 3 of the history list. ..
This asks the history to search for the last command that matches the given pattern (in this case, that pattern is dnf) and execute it.
search history
!! grep -v “^[a-zA-Z]*$” /etc/passwd !! tail -n1 /etc/passwd
Searching your command history for a string can be helpful in finding a specific command. ..
The history command displays the last three commands executed. The grep command finds the string “dnfhistory” in the output of the history command and prints it to the screen. The tail -n 3 command prints the last three lines of output from the history command. ..
You can now type a command and press Return or Enter to execute it.
Changing an executed command
history | grep ssh ..
dnf ssh
removing history
To remove a specific command from your history file, type history -d . To clear the entire contents of the history file, run history -c.
Final note
How to Utilise History Command on Linux: A Guide for Beginners In this guide, we will be discussing how to use history command on linux. This is a very important command that can be used in order to explore and research old files and folders. So without further ado, let’s get started! First of all, you will need to install the necessary software in order to use history command on linux. This can be done by following the given instructions or by using a package manager like aptitude or yum. Once the software is installed, you will need to create a new directory in which you will store your old files and folders. We will call this directory “history”. Now that we have our history directory created, it is time to start using history command. To do so, we first need to open a terminal window and type: #history This will show us a list of all the active commands that are currently running in our history directory. We can then use these commands in order to explore and research old files and folders. For example, let’s explore some of our older files: #history -a 10s | grep “^.” | cut -d’ ’ -f1 | sed ’s/^.$//’ This produces the following output: 10s | grep “^.” | cut -d’ ’ -f1 | sed ’s/^.$//’ 10s | grep “^.*” 10s | head 1
