How to Remove an Alias in Linux

Remove an alias in the current shell session

If you only want to remove an alias temporarily (until you close the terminal), run:

unalias alias_name

Example:

unalias ll

To remove ALL aliases in the current session:

unalias -a

Permanently remove an alias

Persistent aliases are stored in your shell configuration files, such as:

~/.bashrc ~/.bash_profile ~/.profile ~/.zshrc /etc/bash.bashrc /etc/profile

Steps to remove permanently:

Open your config file:
```
nano ~/.bashrc
```
Find the alias line, such as:
```
alias ll='ls -la'
```
Delete it or comment it out:
```
# alias ll='ls -la'
```
Reload your shell configuration:
```
source ~/.bashrc
```
Or restart your terminal.
Check where an alias is defined

To determine whether something is an alias and what file defines it:

type alias_name

Example:

type ll

If you need to search your config files:

grep -R "alias ll" ~/.*

Replace ‘ll’ with the alias name you are investigating.

Quick Reference

Remove alias (current session): unalias alias_name

Remove all aliases (session): unalias -a

Remove alias permanently: Remove or comment the alias line in ~/.bashrc, ~/.zshrc, etc.

Reload shell config: source ~/.bashrc

Check alias definition: type alias_name