& Task management

Usage: &[-|<cmd>]Manage tasks (WARNING: Experimental. Use with caution!)

• & <cmd> run \<cmd> in a new background task
• & list all tasks
• &b 3 break task 3
• &j list all tasks (in JSON)
• &= 3 show output of task 3
• &- 1 delete task #1
• &-* delete all done tasks
• &? show this help
• &t Show a list of task status?
• && 3 wait until task 3 is finished
• && wait until all tasks are finished