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UNIX is an old operating system developed in the early 1970's by AT&T. It is still in use today, and Linux borrows a lot of the ideas and concepts from Unix.
My experience with Unix was back in college, using Solaris operating system. I mostly used SSH (Secure Shell Client) to remotely work on the computer, since I did not want to walk over to the lab to do my homework.
Basic UNIX Commands:
cat - shows the contents of a file.
chmod - changes the permission of a file or folder.
ls - shows a list of files in a directory.
more - displays text one screen at a time
less - shows all the text.
head - shows the first couple lines in a file
tail - shows the last couple lines in a file
date - displays the current date
who - users logged into the system
echo - display some text to screen
clear - clears the screen
pwd - shows the current directory path
rm - remove a file.
mkdir - remove a folder
mv - move a file/rename a file
cp - copy a file
There are a couple of UNIX text editors they are
I suggest you try them all out and just pick the one you like the best.