# Jug Shell¶

The jug shell subcommand opens up a shell within the environment of the Jugfile. It can be used for debugging and exploration of the task structure.

To obtain a list of all tasks seen by jug you can run tasks = get_tasks()

New in version 1.6.5: get_tasks() was only added to the shell in version 1.6.5. Before that you can access tasks directly by importing from jug.task import alltasks as tasks.

Inside the environment, you can use the value(task) function to load results (if available; otherwise, an exception is thrown).

New in version 1.5: invalidate(task) was only added to the shell in version 1.5. Before that, only task.invalidate() (non-recursive) was available.

The invalidate(task) function invalidates the results of its argument and all dependents, recursively, much like the jug invalidate subcommand.

You can call methods on Task objects directly as well:

• run(): run the task and return the result even if the task has run before.
• can_run(): whether all dependencies are available
• can_load(): whether the task has already run
• invalidate(): remove the result of this task (not recursive, unlike the invalidate subcommand, unlike the invalidate function).

You can access the original function with the .f attribute as well.

## Note¶

Jug shell requires IPython to be installed.