Using the alias Command in Linux

As an example lets make ls an alias for ls -lah

Make sure the alias isn't already taken (if that is a problem for your use-case)

type ls
# this returns the use of the command, if its in use

We don't care in this case and actually want to shadow the existing ls command.

Use the alias command

alias ls='ls -lah'

That's it, now you can use the new command you have created

ls