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Linux / UNIX: See If Particular Users Are Logged Into Server

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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Sysadmin because even developers need heroes!!!

UNIX / Linux: Set your PATH Variable Using set or export Command

How do I add a new path to $PATH variable under Linux and UNIX like operating system? What is my path, and how do I set or modify it using csh/tcsh or bash/ksh/sh shell?
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Download and Install csh / tcsh shell on Linux

Cshell is a shell (command interpreter) with C-like syntax. How do I download and install csh shell on a Linux operating system? How can I install csh on a Fedora/RHEL/CentOS Linux server? How do I install tcsh or csh on a Debian or Ubuntu Linux desktop?
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