P(1)

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
/src/cmd/p.c