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Manpages, command summaries, and pretty much everything else usually have the information you're most likely to want at the beginning. Seeing just the last 40 or so lines of options from a command that has 100 is not super useful, and having to scroll up each time you want to glance at something is spastic.
Run this and then do something like
p do vi --help
and you'll get the first screen(-mostly-)full of vi's usage info and options list
to page down, and
to page up.
To see the current page again:
Also useful for situations like
p do aptitude search ~dsmorgasbord
#p sudo aptitude -r install libwickedawesome-perl-snoochieboochies
p sudo aptitude -r install libwickedawesome-perl-snoochieboochies snazztasticorama-dev-v0.∞
where you're using readline up-arrow, HOME, END, etc., to quickly recall commented commands.
For the unaware, that option to aptitude search will bring up all of the packages whose descriptions contain the string "smorgasbord". Depending on your distro, there could potentially be hundreds of them.
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