ps-lpr-command

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

"lpr"

• This variable may be risky if used as a file-local variable.

Documentation:
Name of program for printing a PostScript file.

On MS-DOS and MS-Windows systems, if the value is an empty string then Emacs
will write directly to the printer port named by `ps-printer-name'. The
programs `print' and `nprint' (the standard print programs on Windows NT and
Novell Netware respectively) are handled specially, using `ps-printer-name' as
the destination for output; any other program is treated like `lpr' except that
an explicit filename is given as the last argument.

You can customize this variable.

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