The z command prints an entire screen's worth of lines and let's say want
to continue reading after that screen hit the + command once then hit z
again each followed by the enter key. The + command moves line number up
by 1 and the - or minus command moves one line back up the file. The z -r
parameter on the command line when opening up a file makes the file read
only so you get some protection using that when needed.
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