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UL(1)                     BSD General Commands Manual                    UL(1)

     ul - do underlining

     ul [-i] [-t terminal] [name ...]

     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
     terminfo database 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

     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 underlining which is present in an nroff output stream on a crt-terminal.

     -t terminal
             Overrides the terminal type specified in the environment with terminal.

     The following environment variable is used:

     TERM  The TERM variable is used to relate a tty device with its device capability description (see terminfo(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 setenv(1)).

     man(1), nroff(1), colcrt(1)

     Nroff usually outputs a series of backspaces and underlines intermixed with the text to indicate underlining.  No
     attempt is made to optimize the backward motion.

     The ul command appeared in 3.0BSD.

     The ul command is part of the util-linux-ng package and is available from ftp://ftp.ker-

4th Berkeley Distribution        June 6, 1993        4th Berkeley Distribution