ps-lpr-switches

ps-lpr-switches is a variable defined in `ps-print.el'.
Its value is

nil

Documentation:
List of extra switches to pass to `ps-lpr-command'.

The list element can be:

string it should be an option for `ps-lpr-command' (which see).
For example: "-o Duplex=DuplexNoTumble"

symbol it can be a function or variable symbol. If it's a function
symbol, it should be a function with no argument. The result
of the function or the variable value should be a string or a
list of strings.

list the header should be a symbol function and the tail is the
arguments for this function. This function should return a
string or a list of strings.

Any other value is silently ignored.

It is recommended to set `ps-printer-name' (which see) instead of including an
explicit switch on this list.

See `ps-lpr-command'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 20 of Emacs.