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do shell commands have some of the same functionality as programming languages?

bash and korne are similar (from what i've been told), but is one more stable or better than the other? is it...

is there a difference between a "port" and a "socket"?

I think there are a lot of grey areas in that department...but I think if no code is posted....the question is simply "directional".
solving general issues.

yes....i could and maybe should just...

I didn't want anyone to code for me....I just wanted to make sure I wasn't wasting my time trying to fit the cylinder shape in the opening to the triangle shape.
I was hoping to expand my horizon...

i'm a grad student taking a UNIX course and a networks course (i have a background in C++ and JAVA). i'm trying to combine the two classes.
My questions stems from a networks programming homework...

I'm playing around with linux on a computer I had preinstalled on....

I like it enough that I want to change one of my current computers (Windows ME). Is it as easy as reformatting the hard drive...

if i wanted to ping all the machines in a given directory (/etc/hosts) and return a total count of responses how would i go about scripting that?

complete newbie...so be gentle

if [ -d "$1" ];...