c shell

I‘ve recently started to use FreeBSD operating system with tcsh (c shell clone) shell. I noticed that both set and setenv command set shell user environment. What’s the difference between the SET and SETENV commands?

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How do I see if my friends or coworkers are logged into the same Linux or BSD or UNIX (AIX, HP-UX, Apple OS X) server / workstation as I am from a command line?

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How do I set environment variables using c shell (tcsh or csh) under FreeBSD UNIX or Linux operating systems? How do I save variable using csh shell under Unix like operating systems?

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What is C shell under UNIX / Linux operating systems?

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What is UNIX / Linux Korn Shell?

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