### Realistic quotes for verbatim listings

The `cmtt` font has "curly" quotes, which are pleasing on the eye, but don't really tally with what one sees on a modern xterm\nothtml{ (which look like \texttt{\char18 this\char13})}.

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.

`upquote.sty`
  macros/latex/contrib/upquote/upquote.sty

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