History command in Linux with examples

1. What is history command in Linux?
2. How do I run command history in Linux?
3. Which command in Linux with examples?
4. Where is history file in Linux?
5. How can I see deleted history in Linux?
6. How do I run a shell script?
7. How do I find previous commands in Terminal?
8. How do I find previous commands in Unix?
9. How do I clear the terminal in Linux?
10. Which is command in Linux?
11. What does R mean in Linux?
12. How do I learn Linux commands?

What is history command in Linux?

In Linux, there is a very useful command to show you all of the last commands that have been recently used. The command is simply called history, but can also be accessed by looking at your . bash_history in your home folder. By default, the history command will show you the last five hundred commands you have entered.

How do I run command history in Linux?

Run Commands From Your History

This feature is known as “history expansion” and uses an exclamation mark, known as a “bang”. Just type them at the prompt and press Enter to run them like you'd run any other command. For example, let's say you wanted to run the 12th command from your bash history.

Which command in Linux with examples?

which command in Linux is a command which is used to locate the executable file associated with the given command by searching it in the path environment variable. It has 3 return status as follows: 0 : If all specified commands are found and executable.

Where is history file in Linux?

The history is stored in the ~/. bash_history file by default. You could also run 'cat ~/. bash_history' which is similar but does not include the line numbers or formatting.

How can I see deleted history in Linux?

4 Answers. First, run debugfs /dev/hda13 in your terminal (replacing /dev/hda13 with your own disk/partition). (NOTE: You can find the name of your disk by running df / in the terminal). Once in debug mode, you can use the command lsdel to list inodes corresponding with deleted files.

How do I run a shell script?

Steps to write and execute a script

1. Open the terminal. Go to the directory where you want to create your script.
2. Create a file with . sh extension.
3. Write the script in the file using an editor.
4. Make the script executable with command chmod +x <fileName>.
5. Run the script using ./<fileName>.

How do I find previous commands in Terminal?

Give it a try: in the terminal, hold down Ctrl and press R to invoke "reverse-i-search." Type a letter - like s - and you'll get a match for the most recent command in your history that starts with s. Keep typing to narrow your match. When you hit the jackpot, press Enter to execute the suggested command.

How do I find previous commands in Unix?

Following are the 4 different ways to repeat the last executed command.

1. Use the up arrow to view the previous command and press enter to execute it.
2. Type !! and press enter from the command line.
3. Type !- 1 and press enter from the command line.
4. Press Control+P will display the previous command, press enter to execute it.

How do I clear the terminal in Linux?

You can use Ctrl+L keyboard shortcut in Linux to clear the screen. It works in most terminal emulators. If you use Ctrl+L and clear command in GNOME terminal (default in Ubuntu), you'll notice the difference between their impact.

Which is command in Linux?

Linux which command is used to identify the location of a given executable that is executed when you type the executable name (command) in the terminal prompt. The command searches for the executable specified as an argument in the directories listed in the PATH environment variable.

What does R mean in Linux?

-r, --recursive Read all files under each directory, recursively, following symbolic links only if they are on the command line. This is equivalent to the -d recurse option.

How do I learn Linux commands?

Linux Commands

1. ls — Use the "ls" command to know what files are in the directory you are in. ...
2. cd — Use the "cd" command to go to a directory. ...
3. mkdir & rmdir — Use the mkdir command when you need to create a folder or a directory. ...
4. rm - Use the rm command to delete files and directories.