Aliases, Default and Private Tasks

Aliases

## build

```meta
alias = ["b"]
```

mq-task b runs build.

Default task

# mq-task.toml
default_task = "build"

mq-task with no task name runs build.

Private tasks

A title starting with _, or private = true in meta, hides the task from list/tui (list --all shows it). It can still be run and used as a dependency.

## _cleanup

```bash
rm -rf tmp/
```