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For the last command to work, what file must exist?

You are looking into a new script you received from your senior administrator. In the very first line you notice a #! followed by a path to a binary. Linux will:

Which of the following configuration files should be modified to set default shell variables for all users?

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The ______ command is used to print out the current date and time on the system.

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Which command allows to run a command in a modified environment, without changing the environment variables of the current shell? (Please provide the command name only, not the path.)

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What command would create the following output without using any arguments or options?
Module Size Used by nls_iso8859-1 2880 0 (autoclean)
nls_cp437 4384 0 (autoclean) ….

Which file contains information about all loaded modules?

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In which file you can find these lines?

What command should be entered to print and then delete the file, foobar.txt?

Which directory contains additional information about installed packages?