$ ./report.pl $ echo $? 1 What can be said about what just happened? a) The command completed successfully. b) One argument was passed to report.pl through the environment. c) The script ran for 1 second. d) An error happened during the script.

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.