NAME
p – paginate

SYNOPSIS
p [ –number ] [ file ... ]

DESCRIPTION
P copies its standard input, or the named files if given, to its standard output, stopping at the end of every 22nd line, and between files, to wait for a newline from the user. The option sets the number of lines on a page.

While waiting for a newline, p interprets the commands:
!     Pass the rest of the line to the shell as a command.
q     Quit.

SOURCE
/sys/src/cmd/p.c