When considering the use of hard links, what are valid reasons not to use hard links?

• A.Hard links are not available on all Linux systems because traditional filesystems, such as ext4, do not support them
• B.Each hard link has individual ownership, permissions and ACLs which can lead to unintended disclosure of file content
• C.Hard links are specific to one filesystem and cannot point to files on another filesystem
• D.If users other than root should be able to create hard links, suln has to be installed and configured
• E.When a hard linked file is changed, a copy of the file is created and consumes additional space

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Which of the following commands will print important system information such as the kernel version and machine hardware architecture?

• A.info
• B.sysinfo
• C.arch
• D.lspci
• E.uname

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Which of the following commands shows the definition of a given shell command?

• A.where
• B.stat
• C.type
• D.case

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Which of the following statements is correct for a command ending with an &character?

• A.The command's output is redirected to /dev/null.
• B.The command is run in background of the current shell.
• C.The command's output is executed by the shell.
• D.The command is run as a direct child of the initprocess.
• E.The command's input is read from /dev/null.

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What output will be displayed when the user fredexecutes the following command?
echo 'fred $USER'

• A.fred /home/fred/
• B.fred fred'
• C.fred $USER'
• D.fred fred
• E.fred $USER

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