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[[shell]]
== Erlang shell
Erlang.mk provides a convenient target for starting a shell
with all the paths set properly to experiment with your code.
=== Configuration
The `SHELL_DEPS` variable can be used to define dependencies
that are only to be used when the `make shell` command is called.
For example, if you want to use _kjell_ as your shell:
[source,make]
SHELL_DEPS = kjell
Dependencies are downloaded and compiled the first time you
run the `make shell` command.
You can customize the executable used to start the Erlang shell.
To continue with our example, if you want to use _kjell_ as your
shell, you also need to change `SHELL_ERL` and point it to the
`kjell` executable:
[source,make]
SHELL_ERL = $(DEPS_DIR)/kjell/bin/kjell
You can specify additional options to be used when starting the
shell using the `SHELL_OPTS` variable:
[source,make]
SHELL_OPTS = -setcookie chocolate
Any of the usual `erl` options can be used, including `-eval`:
[source,make]
SHELL_OPTS = -eval 'my_app:run()'
=== Usage
To start the shell, all you need is the following command:
[source,bash]
$ make shell
The shell can be stopped as usual with a double Ctrl+C or the
command `q().`.
Note that the `shell` target does not build the application. To do it,
use either the `app` target or, if you want to include also test
modules, the `test-build` target.
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