Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:
Hi, since I'm relatively new to Unix I need some help. I've installed FreeBSD 8 on a virtual machine and I've done most of the tasks but don't know if I'm right or wrong ;/
Here it goes:
1. Why do folders /bin and /usr/bin usually come out at the first place as an output of the command echo $PATH?
2. Explain what would be the result of the command $ `date`
3. You want to concatenate the two files foo1 and foo2 but you have to put some text from the command line between them too. How would you do that?
4. If a command procedure contains a command:
echo ${d-'*'}
what would come out?
5. Can you use sh < foo.sh instead of sh foo.sh to execute a script?

2. Relevant commands, code, scripts, algorithms:
echo $PATH
$ `date`
echo ${d-'*'}


3. The attempts at a solution (include all code and scripts):
Ok, first of all I don't know why but I can't create files to test some commands ;/ I mean I write for example cat >file1 and it says "Cannot create file1. Read-only file system."
Here are my answers dunno if I'm right or wrong so please help me :]
1. Because in those folders are the most important system scripts, files etc. that are being used when the operating system loads
2. In my case it came out: Thu: not found.
But when I change `` to ' ' it says the correct date. Is that the catch here?
3. Aah maybe:
cat >>foo1 foo2 >foo3 or maybe not?^^
4. It prints out - * ?
5. I'm not sure about that one - maybe you can, because < is used for input

Thanx a lot

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
New Bulgarian University, Sofia, Bulgaria, N.Gadjev, CSCB584 UNIX

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).