Using the Command Line to Get Help

30 minutes
  • 3 Learning Objectives

About this Hands-on Lab

In this hands-on lab, we’ll make use of documentation available from the command line to answer specific questions about a command or file. Man and info pages are readily available, useful sources of documentation on Linux commands and configuration files.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Determine How Many Lines the File Contains
  1. The documentation found in the man and info pages suggests that the -l option may be used to determine the total number of lines.
    wc -l longfile.txt
  2. Run the command and output the result into a new file named value.txt.
    wc -l longfile.txt > value.txt
Determine the Number of Characters on the Longest Line
  1. The documentation found in the man and info pages suggests that the -L option may be used to determine the number of characters on the longest line.
    wc -L longfile.txt
  2. Run the command and append the result to the value.txt file.
    wc -L longfile.txt >> value.txt
Determine the Total Number of Characters in the File
  1. The documentation found in the man and info pages suggests that the -m option may be used to determine the total number of characters in the file.
    wc -m longfile.txt
  2. Run the command and append the result to the value.txt file.
    wc -m longfile.txt >> value.txt

Additional Resources

There is a file in /home/cloud_user named longfile.txt. Use documentation available to you from the command line and the wc command to answer the following questions:

  • How many lines does the file contain?

  • How many characters wide is the longest line?

  • How many characters are in the file?

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