Command Piping and Redirection

45 minutes
  • 3 Learning Objectives

About this Hands-on Lab

In this hands-on lab, we will use piping and redirection to populate a file with the specific results of commands. Understanding piping and redirection takes practice, and in this lab you will practice both to populate a file using redirection with data process with piping. By the end of this lab, you should be comfortable piping output from one command to another, and redirecting the output to a file.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Determine the Number of Files and Folders in `/usr/share`
  1. Run the following commands:
    ls /usr/share/ | wc -l
    ls /usr/share/ | wc -l > ~/value.txt
Determine the Number of Unpacked Entries in `/var/log/dpkg.log`
  1. Run the following commands:
    cat /var/log/dpkg.log | grep unpacked | wc -l
    cat /var/log/dpkg.log | grep unpacked | wc -l >> ~/value.txt
Determine the Total Number of Entries in `/var/log/dpkg.log`
  1. Run the following commands:
    cat /var/log/dpkg.log | wc -l
    cat /var/log/dpkg.log | wc -l >> ~/value.txt

Additional Resources

You have been asked to answer the following questions and place the results in a file named ~/value.txt:

  • How many files and folders are in /usr/share?

  • How many unpacked entries are in the log file /var/log/dpkg.log?

  • What is the total number of entries in /var/log/dpkg.log?

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