Analyze Historical Commands

Introduction

In this challenge, you will analyze the history of commands run on a Linux system while practicing data stream redirection. This task will help you enhance your text processing, analysis skills, and understanding of input/output manipulation in Linux environments.

Skills Graph

Analyze Historical Commands Using Stream Redirection

Requirements

You need to analyze a file containing a record of command usage. Your task is to identify the top three most frequently used commands in the file and save the results in /home/labex/project/result. You must use stream redirection techniques to accomplish this task.

Tasks

1. Use the sort, uniq, and head commands in combination with stream redirection to process the data1 file located in /home/labex/project/.
2. Redirect the output to /home/labex/project/result.
3. Ensure that results include both the number of occurrences and the command, formatted as "count command" (e.g., "100 ls").

Example

A sample of the data1 file content:

895  echo $?
896  openstack compute service list
897  cd /home/chy/openstack/
898  . admin-openrc
...

The expected output format for the top commands in /home/labex/project/result:

150 openstack
114 systemctl
105 ls

Tips

You may need to use awk to extract the command from the file content. awk usage:

• awk '{print $2}': Prints the second field of each line.
• awk '{print $1, $2}': Prints the first and second fields of each line.

Summary

Congratulations! You have successfully completed the challenge. You've practiced analyzing command usage history while applying Linux stream redirection techniques. This exercise has helped you improve your text processing abilities, familiarity with common Linux commands, and understanding of input/output manipulation. These skills are invaluable for system administrators and power users working in Linux environments.