w command

What is a tty under Linux / UNIX? How do I find out what tty I’m on?

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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 print the user names of users currently logged in to the current UNIX / Linux host / server from a command prompt?

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Q. Can you explain the command to find what users are doing on my UNIX / Linux system? A. Both Linux and UNIX (FreeBSD/Solaris) has w command to show who is logged on and what they are doing. The w command prints a summary of the current activity on the system, including what each user [...]

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I’d like to find out how long the system has been running under UNIX or Linux operating system. How do I find out system uptime?

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