Performs underlining.
The ul command reads the named files specified by the File parameter (or standard input if no file is given) and translates occurrences of underscores to the sequence that indicates underlining for the terminal in use, as specified by the TERM environment variable.
| Item | Description |
|---|---|
| -i | Causes the ul command to indicate underlining by a separate line containing appropriate _ (underline characters). Use this to see the underlining present in an nroff command output stream on a CRT terminal. |
| -t Terminal | Overrides the terminal type specified in the environment.
The terminfo file
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 mode is used instead. If the terminal can overstrike
or automatically underline, the ul command acts like the cat command
and displays on the screen. If the terminal cannot underline and no
alternatives are available, underlining is ignored. If the -t flag is not specified, the ul command translates for the terminal type specified by the TERM environment variable. If the value of the Terminal variable is not a valid terminal type, the ul command translates for a dumb terminal. |
| Item | Description |
|---|---|
| /usr/share/lib/terminfo/* | Contains the terminal capabilities database. |