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Shell $EUID

Linux / Unix Shell Script: Get Current User Name

I am working on a shell script. I need to find out the current user name. How do I find out the current user name under Bash or Ksh shell running on Linux or Unix like operating systems?
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Linux / Unix: id Command Examples

id command

I am a new Linux and Unix system user. How do I find out the user and groups names and numeric IDs of the current user or any users on my server? How can I display and effective IDs on the system using command line options? In Linux, how do I find a user's UID or GID?
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