On your Mac OS X terminal you can use the open command like a double click.
For example you can issue the following command:
# open .
this command will open the working directory in the finder.
now imagine you want to open all the .doc document in the working directory, you can issue the following command:
# open *.doc
adding some switches you can do more. Now imagine you want to open all the .doc document in the working directory with openoffice, you only need to add the "-a" switch:
# open -a swriter *.doc
with the "-e" switch Mac OS X will open your files with TextEdit
with the "-g" the Terminal will remain in foreground.
See the man page for further information.
Gg1