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Linux Command: List All Users In The System

I'm a new Linux sys admin and I'm unable to find the command to list all users on my RHEL server. What is the command to list users under Linux operating systems?
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Linux / Unix: Cat Command Examples

cat command

I am a new Linux and Unix system user. How do I use cat command on Linux or Unix-like operating systems? Can you provide basic examples and syntax usage for cat command?
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How do I display my current path settings under Linux / FreeBSD / OpenBSD / NetBSD / Apple OS X / UNIX like operating systems using bash or ksh or csh / tcsh shell?
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