Either a symbol or logical which is named DVI$DVI2TTY can be set to hold
command line options. As an example, if you wish to normally have your
output written to the file dvi2tty.output and wish to also have
the output be 132 columns in width, you may define the logical name
DVI$DVI2TTY as in;
$ DEFINE DVI$DVI2TTY ``o dvi2tty.output w 132''
Options set in the environment variable will be overridden by conflicting
options on the command line.