LFCS Question #863: Real Exam Question with Answer & Explanation

Question

When given the following command line. echo "foo bar" | tee bar | cat Which of the following output is created?

Options

• Acat
• Bfoo bar
• Ctee bar
• Dbar
• Efoo

Explanation

The echo command outputs "foo bar", which tee writes to a file named bar and also passes to cat, resulting in "foo bar" being printed to standard output.

Common mistakes.

• A. cat is the command itself, and it will output its input, not its own name.
• C. tee bar is a command and arguments; the output of the pipeline is the data processed by the commands, not the command names.
• D. bar is the name of the file created by tee, not the data being passed through the pipeline to standard output.
• E. foo is only part of the string; the entire string "foo bar" is processed and output.

Concept tested. Command piping and tee utility

Reference. https://www.gnu.org/software/coreutils/manual/html_node/tee-invocation.html

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