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newb commandline scripting and c/c++



Again forgive me if this is the wrong list.
I looked over all of the mailing list and there isn't one for:
	newbie shell scripting
	beginner commandline c/c++

I opened a new file with vi calling it ll (LL) and I put the following line in it:
ls -al


I then
	chmod +x ll
	sudo mv ll /usr/bin

it worked as I thought it would.
I then opened a new file with vi calling it myc and I put the following line in it:
cd /Developer/sandbox/myc


I then
	chmod +x myc
	sudo mv myc /usr/bin

however when I myc nothing happens, literally, no error, and no change in directory no matter where I am.

So 2 questions:
What dumb thing am I over looking here or is this a mac thing?

AND

I use to get into my .profile file on an AIX machine and I used
alias ll 'ls -al'
alias myc 'cd /Developer/sandbox/myc'

Is there a similar way to use aliases on the mac so I can have typing short-cuts when on the commandline?



Steve -New to Mac
PS...I love this machine, I just want to learn to code on it and I'm starting from the ground/commandline up!

Currently I'm using WROX Begiining Linux Programming


So any beginning mac programming site's or books or other info is greatly appreciated.



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