You can use
find; e.g.,
Code:
log in as root or use sudo
find / -type f -name '*.orig' -exec rm {} \;
You may want to see what you're going to do before you remove them all with
Code:
find / -type f -name '*.orig' -print
and review the list.
Hope this helps some.
[EDIT] By the way, don't double-post questions (this appears in both the newbie and Slackware forums).