Currently, there's no easy way to view the list of commands. All you can do is press the Up key to see one at a time.
Easiest would be to treat history as a special case, much like history is a bash builtin.
add 'history' command
add man page for `wp shell`
compute the history file path at the beginning
this avoids problems if the user calls chdir()
add test for 'history' builtin; see #373
shell: remove support for 'history' builtin
1. The syntax felt kind of inconsistent.
2. Boris doesn't support it.
3. It didn't ship with a stable release, so not many people know about