There are two ways to quit out of an Interactive Elixir shell. The standard
way is with Ctrl-c. This gives you a list of options, one of which is a
for abort. This will terminate your IEx session and drop you back on the
command line where the process started.
Additionally, IEx also understands Ctrl-\ which is control key that will
terminate just about any interactive environment. This command will cause
IEx to immediately exit with no prompt.
Note: IEx does not, however, respond to Ctrl-d.