If you run mgv without a file name or with a file name of "
then one of two things will happen:
$ mgvwill just start an instance of mgv without a file; if you run mgv like this:
$ mgv somefile.psthen mgv will open
somefile.psas the initial file; if you run mgv like this:
$ mgv < somefile.ps $ mgv - < somefile.ps $ cat somefile.ps | mgv $ cat somefile.ps | mgv -then mgv will end up reading
somefile.psfrom the standard input. If you have asked mgv to copy files from the standard input using the copyStdin resource, then mgv will copy the standard input to a temporary file and work from the temporary file. Note that if a file is read from standard input and not copied, you will only be able to move to the next page: you won't be able to jump to an arbitrary page and you won't be able to move backwards.