Many terminals, such as xterm, support a feature known as rmcup. It
restores the screen to what it looked like before a program was run. The situation
also occurs with any full-screen terminal program, such as man or less; the
program’s text disappears after you quit the program, and the prompt
“window” is restored http://blogs.oracle.com/samf/entry/smcup_rmcup_hate
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