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shell variables

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?
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Use export Command in Linux / Unix

How do I use export command under Linux or Unix like operating systems to set variables?
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Bash: Pass Shell Variables To awk

How do I pass shell variables to awk command or script under UNIX like 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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How do I call Oracle or MySQL sql statements in UNIX / Linux shell scripts?
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Bash Shell Loop Over Set of Files

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