unalias:tldr:04481

The command "unalias -a" is used to remove all the aliases that are currently defined in the shell.

In a shell environment, an alias is a custom-made shortcut for a command. It allows the user to define their own commands or modify existing ones. These aliases are stored in the shell's memory and can be useful for saving typing time or creating alternative command names.

However, there may be situations where you want to remove all the aliases at once. This is where the "unalias -a" command comes in. When executed, it removes all the aliases, regardless of whether they were created by the user or came predefined with the shell.

This command is especially useful if you want to undo all the aliasing modifications you have made or if you want to go back to the default behavior of the shell where no aliases are defined.