newbie with linux~
 

what is the #! called?thanks

Do you mean the terminal prompt?

http://en.wikipedia.org/wiki/Shebang_(Unix)

Curiously, Google will not find anything on #! You just get an empty page???

mrryanthai;
Is this homework also?
What books are you studying?

Usually that combination of characters appears on the first line of a shell script.

The "#!" precedes the interpreter that the script will use when opening a child process environment to run the script. This must be the first line in a shell script.

I think you mean Linux scripts. If yes, check this bash scripting tutorial explains it straight at the beginning. The same approach applies also for perl: Perl programming tutorial

hope this helps