Rudo is a simple command line based todo list editor.  Here are the commands:

# see the first n items on the list (default 5)
rudo

# add a task to the list
rad 'my task'

# add a task to the 2nd position
rad 'another task' 2

# mark the first task finished
dun

# mark the 5th task finished
dun 5

# mark the first 3 tasks finished
dun 3x

# move the first item to the back of the list
walk

# move the first 3 items to the back of the list
walk 3