alternate screen

[aeosynth]

I'm writing a 'full screen' TUI, and want to use the alternate screen to not mess up the user's main screen.

https://stackoverflow.com/a/11024208/131023

You can switch to the alternate screen using this command:

$ tput smcup

And back with:

$ tput rmcup

[pksunkara]

I would appreciate if you can send a PR.