Lastly, the C shell has a reputation for having many shortcuts, and as you can tell from the name, is C friendly and you'll do well with this if you know C. I am not particularly fond of the csh, as I find the syntax to be a bit tricky. Csh is also known to be a little slower then the other shells. Though there are many similarities, there are also plenty of differences when it comes to syntax, so my recommendation is to work with one only. If you want to choose one, stay with bash, the Linux bourne shell.
The Unix shell has two purposes, one is a scripting language, the other as a command line interpreter to run commands. When you say "login" shell, that is really the second purpose. Commands are being executed from that shell. As far as tips, I would try to familiarize yourself with the .profile, which in Unix is the first file that is looked at when you log in and is used to customize your environment. Put whatever setting you want here, and it will make your life much easier.
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