In Texis version 8 and later, many Texis executables also allow the
two-argument form of long command-line options that take a value.
E.g. in addition to the "--install-dir=/texis/install/dir"
assignment form historically supported, in version 8 "-install-dir /texis/install/dir" may also be given. This can
make generating Vortex command lines for
See the individual executables command-line help for details.