[CentOS] What's the Linux equivelant of an exe file?

> Ahhhh !!!! Just harken back to (glorious, IMHO) IRIX, & you should be 
> off to the races. Many common Linux command line commands are named 
> for their IRIX equivalents, so the familiarity should return quickly. 

One might think so, but it was seven years ago since I was running 
SoftImage on Irix machines. Except for a brief experiment with running 
Linux about 6 years ago, I haven't touched a UNIX/IRIX/Linux machine 
since, and the commands are long since forgotten. I still remember basic 
concepts, like the differences between a super user and regular user, 
and file permissions and those kinds of general principles. But specific 
commands I can't remember at all.

I'm afraid my UNIX abilities have atrophied down to newbie level.

Dave