Linux equivalent of the Mac OS X “open” command [closed]

I’ve found the “open” command in Mac OS X very handy in the command line. From “man open”:

The open command opens a file (or a directory or URL), just as if you had
double-clicked the file’s icon. If no application name is specified, the
default application as determined via LaunchServices is used to open the
specified files.

That is, if I want to open a PDF file with the default PDF viewer (happens to be Preview), I only need to do:

open my.pdf

In Linux, however, to open a PDF file from the command line, I had to dig around to find the default PDF viewer is, for instance, “evince” (who’d have guessed??), and then

evince my.pdf

So, is there a simple equivalent of the ‘open’ command in the Linux command line?

Thanks!