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env command

Linux: List All Environment Variables Command

How do I display all my environment variables using bash shell on RHEL / Debian / Ubuntu / CentOS / Fedora / Mint Linux operating systems?
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Linux: Set Environment Variable

Bash shell is used for various purposes under Linux. How do I customize the shell environment variable under Linux operating systems?
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FreeBSD Display Environment Settings

Q. How do I display shell environment settings under FreeBSD operating systems?
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