shell variables

How do I see a list of all exported variables and functions under Unix bash shell?

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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?

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How do I use export command under Linux or Unix like operating systems to set variables?

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How do I pass shell variables to awk command or script under UNIX like operating systems?

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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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How do I call Oracle or MySQL sql statements in UNIX / Linux shell scripts?

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How do I run shell loop over set of files stored in a current directory or specified directory?

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