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For various reasons, I have to use TeX rather than LaTeX for a short document. I need to be able to insert a short blank underline within a paragraph. In LaTeX, this would be done easily with \rule{length}{thickness}. What is the plain TeX equivalent?

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    \def\rule#1#2{\leavevmode\vrule width #1 height #2 depth 0pt\relax} – egreg Jan 24 '20 at 16:39
  • That almost works, but it seems to be ignoring the height argument. – Grant Petty Jan 24 '20 at 16:40
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    I forgot to set depth. – egreg Jan 24 '20 at 16:45
  • I ended up using a slight modification with just one argument: \def\rule#1{\leavevmode\vrule width #1 height 0.45pt depth 0pt\relax} – Grant Petty Jan 24 '20 at 17:04
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For a long underline you can use \hrulefill inside a box:

Some text with no real sense, just to fill
\hbox to 6em{\hrulefill} some space.

\bye

enter image description here

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