02-16-2013
I can't see where the while loop in your script in post #1 reads from; as is it would read from stdin which might be your terminal. Are you sure the variable dline holds a valid file name?
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UL(1) General Commands Manual UL(1)
NAME
ul - do underlining
SYNOPSIS
ul [ -i ] [ -t terminal ] [ name ... ]
DESCRIPTION
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 -t option overrides the terminal kind specified in
the environment. The file /etc/termcap 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 automati-
cally, ul degenerates to cat(1). If the terminal cannot underline, underlining is ignored.
The -i option causes ul to indicate underlining onto 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.
SEE ALSO
man(1), nroff(1), colcrt(1)
BUGS
Nroff usually outputs a series of backspaces and underlines intermixed with the text to indicate underlining. No attempt is made to opti-
mize the backward motion.
4th Berkeley Distribution May 7, 1986 UL(1)