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?
ow 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?
shell 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?