Linux / Unix: Bash Shell See All Exported Variables and Functions

How do I see a list of all exported variables and functions under Unix bash shell?
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Bash Assign Output of Shell Command To Variable

How do I assign the output of a shell command to a shell variable under Unix like operating system? For example, I want to store the date command output to a variable called $now. How do you do that? How can I set a variable to the output of a command in Bash?
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Use export Command in Linux / Unix

How do I use export command under a Linux or Unix-like operating systems to set variables on a bash shell?
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Bash Pass Shell Variables To Awk Script

How do I pass shell variables to awk command or script under Linux or UNIX-like operating systems? How do I use shell variables in an awk script? How can I allow awk to use shell variables?
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