Denys Vlasenko wrote:

What is altscreen?

In Coreutils and in BSDs when you use less(1)/more(1) to view a file
an alternate screen opens that closes after exiting. Like in vim/nvi,
you open a file in a terminal, kind of a new window opens and when you
exit you don't see what you've done.

Coreutils less(1) can behave like BusyBox' one with -X option. From
the man page:

-X or --no-init
Disables sending the termcap initialization and deinitialization
strings  to  the  terminal.   This is sometimes desirable if the
deinitialization string does something unnecessary, like  clearing
the screen.
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