Linux Command Line Pipes and Tail Command
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Questions and Answers

What does the > character do when used to redirect the standard output of a command?

  • It appends to a file instead of overwriting it
  • It displays the output on the screen
  • It redirects standard error instead of standard output
  • It overwrites any contents of an existing file (correct)
  • How can the contents of an existing file be preserved when redirecting the standard output of a command?

  • By using the < character
  • By using the << character
  • By using the >> character (correct)
  • By using the > character
  • What happens when the number 2 is placed before the arrow > character in redirection?

  • It redirects standard output to a file
  • It redirects standard error to a file (correct)
  • It appends to a file instead of overwriting it
  • It displays both standard output and standard error on the screen
  • What does the >> character do when used in redirection?

    <p>It appends to a file instead of overwriting it</p> Signup and view all the answers

    What does the negative value option (-n) do in the tail command?

    <p>Show the specified number of lines from the end of the file</p> Signup and view all the answers

    What is the purpose of using the pipe character (|) in command line?

    <p>To send the output of one command to another</p> Signup and view all the answers

    What is STDIN in I/O redirection?

    <p>Standard input, or information entered by the user via the keyboard</p> Signup and view all the answers

    How is I/O redirection achieved in command line?

    <p>By using the arrow &lt; &gt; characters</p> Signup and view all the answers

    What does the ^ character signify in regular expressions?

    <p>Beginning of the line</p> Signup and view all the answers

    Which command is mentioned as also supporting regular expressions besides the grep command?

    <p>more</p> Signup and view all the answers

    What does the pattern 'r..f' match in the given example?

    <p>Any line that contains the letter r followed by exactly two characters and then the letter f</p> Signup and view all the answers

    When would the $ character match in a regular expression pattern?

    <p>End of the line</p> Signup and view all the answers

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