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Linux Shell Productivity: Aliases & Navigation Shortcuts

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DevOps engineers often work with long, complex commands. Learning how to create shortcuts and navigate the shell efficiently can save hours of time every week.

⚡ Alias Command

An alias is a custom shortcut for a long command. It allows you to replace a complex string with a single word.

1. Creating a Temporary Alias

You can create an alias by using the alias command. However, manual aliases are not passed to child processes.

[opc@new-k8s ~]$ alias c="clear"
[opc@new-k8s ~]$ c
# (Terminal screen clears)

[opc@new-k8s ~]$ bash                # Enter a new child shell
[opc@new-k8s ~]$ c
bash: c: command not found           # Alias is missing in child shell
[opc@new-k8s ~]$ exit                # Return to original shell

2. Listing and Removing Aliases

To see all active aliases, run alias without arguments. To remove an alias, use unalias.

[opc@new-k8s ~]$ unalias c
[opc@new-k8s ~]$ c
bash: c: command not found

💾 Persisting Aliases (.bashrc)

Manual aliases are lost when you close your terminal. To make them permanent, add them to your ~/.bashrc file and reload the configuration using the source command.

[opc@new-k8s ~]$ echo 'alias c="clear"' >> ~/.bashrc
[opc@new-k8s ~]$ source ~/.bashrc   # Apply changes immediately

[opc@new-k8s ~]$ bash                # Enter a new child shell
[opc@new-k8s ~]$ c                   # It works now!
[opc@new-k8s ~]$ exit

Now, c will work in every new terminal session.

📜 Command History

The shell keeps a record of every command you type. You can use this history to re-run commands without retyping them.

1. Viewing History

Run history to see a numbered list of your past commands.

[opc@new-k8s ~]$ date
[opc@new-k8s ~]$ whoami
[opc@new-k8s ~]$ ls
[opc@new-k8s ~]$ history | tail -n 5
  501  date
  502  whoami
  503  ls
  504  history

2. Using History Shortcuts

  • !! → Run the last command again.
  • !501 → Run command number 501 from your history.

🧭 Fast Navigation Shortcuts

Moving between directories efficiently is key to shell productivity.

1. Switch to Previous Directory (cd -)

If you were just in /tmp and moved to your home directory, you can jump back instantly using -.

[opc@new-k8s ~]$ cd /tmp
[opc@new-k8s tmp]$ cd ~
[opc@new-k8s ~]$ cd -
/tmp
[opc@new-k8s tmp]$ cd -
/home/opc

2. Return Home (cd ~ or cd)

Typing cd without any arguments or cd ~ always returns you to your home directory.

🔍 Reverse Search (Ctrl + R)

Instead of scrolling through history with arrow keys, you can search for a previous command by typing part of it.

  1. Press Ctrl + R.
  2. Start typing the command (e.g., alias).
  3. The shell will find the most recent matching command (like alias c="clear").
  4. Press Enter to run it or use arrow keys to edit it.

🧠 Productivity Quiz

#

Which command allows you to return to the directory you were in immediately before the current one?

📝 Want More Practice?

Check out our other shell guides: 👉 Linux Shell Basics: Variables & PATH

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