CentOS 7.0 - man page for ul (centos section 1)

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UL(1)					  User Commands 				    UL(1)

       ul - do underlining

       ul [options] [file ...]

       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 over-
       strike, or handles underlining automatically, ul degenerates to cat(1).	If  the  terminal
       cannot underline, underlining is ignored.

       -i, --indicated
	      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, -T, --terminal terminal
	      Overrides the terminal type specified in the environment with TERM.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display a help text and exit.

       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)).

       colcrt(1), login(1), man(1), nroff(1), setenv(1), terminfo(5)

       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 package and is available from Linux Kernel
       Archive <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.

util-linux				  September 2011				    UL(1)
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