Linux: compound commands

command1 is executed, then command2, and then command3

command2 is executed only if command1 run successfully (exit code is 0), command3 is executed only if command2 run successfully (exit code is 0)

command2 is executed only if command1 exit code is 0 (failure), command3 is executed only if command2 exit code is 0 (failure)

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Ruby is simple in appearance, but is very complex inside, just like our human body.

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