When I start a program from a terminal I can't use that terminal instance again until I close the program.
Is there a way to execute a program/application from a terminal without blocking the terminal until the program ends?
You are looking for job control which is supported by most shells. See this article for an introduction. At some point you might also want to read the official documentation for bash which is the default shell in Ubuntu.
In short: To start a job automatically in the background put an
You can also stop programs with CTRLz and then put them into the background later with
To get them to run in the foreground again use
Screen controls multiple virtual terminals so you can run multiple programs without them interacting with each other. For example, you can run mocp (a music player), aptitude (a package manager), and vim (a text editor) simultaneously, even though all are interactive programs which treat the terminal as if they had sole access.
This makes it easy to switch from one task to another, such as creating a new terminal within screen to read a manpage – without losing your place elsewhere – flipping back and forth, etc.