How can I clear previous output in Terminal in Mac OS X?

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I know the clear command that ‘clears’ the current screen, but it does this just by printing lots of newlines – the cleared contents just get scrolled up.

Is there a way to completely wipe all previous output from the terminal so that I can’t reach it even by scrolling up?

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To clear the terminal manually:

⌘+K

Command+K for newer keyboards

To clear the terminal from within a shell script;

/usr/bin/osascript -e 'tell application "System Events" to tell process "Terminal" to keystroke "k" using command down'

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