cmtt font has “curly” quotes,
which are pleasing on the eye, but don’t really tally with what one
sees on a modern
xterm.
The appearance of these quotes is critical in program listings,
particularly in those of Unix-like shell scripts. The
upquote package modifies the behaviour of the
verbatim environment so that the output is a clearer
representation of what the user must type.
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URL for this question: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=upquot
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This is FAQ version 3.27, released on 2013-06-07.