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\"     @(#)ul.1 8.1 (Berkeley) 6/6/93
\"
Dd June 23, 2016
Dt UL 1
Os
Sh NAME
Nm ul
Nd do underlining
Sh SYNOPSIS
Nm
Op Fl i
Op Fl t Ar terminal
Op Ar name Ar ...
Sh DESCRIPTION
Nm
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
Ev TERM .
The file
Pa /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,
Nm
degenerates to
Xr cat 1 .
If the terminal cannot underline, underlining is ignored.
Pp
The following options are available:
Bl -tag -width Ds
It Fl i
Underlining is indicated by a separate line containing appropriate
dashes `\-'; this is useful when you want to look at the underlining
which is present in an
Xr nroff 1
output stream on a crt-terminal.
It Fl t Ar terminal
Overrides the terminal type specified in the environment with
Ar terminal .
El
Sh ENVIRONMENT
The following environment variable is used:
Bl -tag -width TERM
It Ev TERM
The
Ev TERM
variable is used to relate a tty device
with its device capability description (see
Xr terminfo 5 ) .
Ev TERM
is set at login time, either by the default terminal type
specified in
Pa /etc/ttys
or as set during the login process by the user in their
Pa login
file (see for example
Xr csh 1 Ns 's Ic setenv ) .
El
Sh FILES
Bl -tag -width /usr/share/misc/terminfo -compact
It Pa /usr/share/misc/terminfo
File containing terminal descriptions.
El
Sh SEE ALSO
Xr colcrt 1 ,
Xr man 1 ,
Xr nroff 1 ,
Xr terminfo 3 ,
Xr terminfo 5
Sh HISTORY
The
Nm
command appeared in
Bx 3.0 .
Sh BUGS
Xr nroff 1
usually outputs a series of backspaces and underlines intermixed
with the text to indicate underlining.  No attempt is made to optimize
the backward motion.

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