About Oracle Export Import and about Oracle $ symbol = SP2-0734: Unknown command beginning "exp username ..." &#

About Oracle Export Import and the $ symbol about Oracle

There are still a lot of things I learned. In fact, I just didn't take the correct path, but I just thought that I could go on the path I understood.
First, export the data directly.
CMD>
Exp username/password @ orcl file =/path/DB. SQL log =/path/dblog. Log owner = Username
But I thought it was all executed under SQL, so according to the Internet, the results would not work. In fact, I went to check the directory myself, or I was a little bit confused, to clear. It is a command. Why? Just like running Java on a command line. Is it necessary to run Java in the java mode? Alas, you are stupid enough. Later, I found the following operation on the Internet.

SQL>
$ Exp username/password @ orcl file =/path/DB. SQL log =/path/dblog. Log owner = Username
It can also run successfully. I am local and remote. (Of course, this is shell) cannot be executed.
It seems that I am a cainiao. I can't execute it with the following command in shell. Well, I have made it for a long time. I thought it was a permission. What's the reason? Well, I asked myself more, ask a verified colleague to solve the problem immediately. Alas, there may be other research headers, but I am, so far, because there are other things to do.

This is the command line that can be run, and the problem of running in the Oracle command line. Remember.

Generally
SP2-0734: Unknown command beginning "exp username..."-rest of line ignored.