Linux and Unix ul command
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Originally appeared in BSD3.0, UL reads the named filenames or terminal and does underlining.
ul [-i] [ -t terminal ] [filename]
| -i | Indicate underlining 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 | Override the terminal kind specified in the environment. If the terminal cannot underline, underlining is ignored. If the terminal name is not found, no underlining is attempted. |
| filename | Name of the file. |
ul myfile.txt
runs ul through the file myfile.txt.