Some UNIX tips

Use the UNIX "ls" command to see if you have a directory called "bin".
If not, create this directory by typing
```
	   mkdir bin
	
```
Then copy the cc201 command by typing
```
	   cp ~chang/pub/cs201/cc201 bin
	
```
Check that you copied correctly by typing
```
	   ls bin
	
```
A file called "cc201" should be listed.
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