$_ variable provided by bash is always set to the last argument of the
previous command. One handy use of this is for changing directories into a
newly created directory.
$ mkdir new_dir && cd $_
This command will leave you in your newly created directory,
We can imagine using this bash variable in a number of similar scenarios as well. What if we are using some language specific command that creates a directory? Will it work when creating a new Phoenix or Rails project?
It sure will.
Give it a try with Phoenix:
mix phx.new my_app && cd $_
or with Rails:
rails new app && cd $_