07-14-2009
When on the receiving end of a pipe less generates output. With less filename you have to play with ^V the space bar and so on. You are in interactive mode.
It's behavior depends on the terminal "type" of stdin. In a script or on the receiving end of a pipe, stdin is not a terminal. less uses termcap based on terminal type to determine base behavior when it is entered on the command line.
I'm guessing this is what you are asking.
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UL(1) BSD General Commands Manual UL(1)
NAME
ul -- do underlining
SYNOPSIS
ul [-i] [-t terminal] [name ...]
DESCRIPTION
ul reads the named files (or standard input if none are given) and translates occurrences of underscores to the sequence which indicates
underlining for the terminal in use, as specified by the environment variable TERM. The file /usr/share/misc/terminfo is read to determine
the appropriate sequences for underlining. If the terminal is incapable of underlining, but is capable of a standout mode then that is used
instead. If the terminal can overstrike, or handles underlining automatically, ul degenerates to cat(1). If the terminal cannot underline,
underlining is ignored.
The following options are available:
-i Underlining is indicated by a separate line containing appropriate dashes `-'; this is useful when you want to look at the underlin-
ing which is present in an nroff(1) output stream on a crt-terminal.
-t terminal
Overrides the terminal type specified in the environment with terminal.
ENVIRONMENT
The following environment variable is used:
TERM The TERM variable is used to relate a tty device with its device capability description (see termcap(5)). TERM is set at login time,
either by the default terminal type specified in /etc/ttys or as set during the login process by the user in their login file (see for
example csh(1)'s setenv).
SEE ALSO
colcrt(1), man(1), nroff(1)
HISTORY
The ul command appeared in 3.0BSD.
BUGS
nroff(1) usually outputs a series of backspaces and underlines intermixed with the text to indicate underlining. No attempt is made to opti-
mize the backward motion.
BSD
September 29, 2009 BSD