- Lab
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Libraries: If you want this lab, consider one of these libraries.
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Searching and Finding Data in Files
In this hands-on lab, we'll practice using `grep`, piping, and regular expressions to pull discrete data from a large file. Being able to parse a large file and narrow down the output to just what you're looking for is one of the strengths of the command line. We're often called to work with large log files, and pull just the relevant bits for analysis. By the end of this lab, you will be comfortable using basic regular expressions to narrow the contents of a large file.
Lab Info
Table of Contents
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Challenge
Determine How Many Words Start with the Letter "x"
- Run the following command:
cat /usr/share/dict/words | grep -E "^x" | wc -l- Send the output to
~/value.txt.
cat /usr/share/dict/words | grep -E "^x" | wc -l >> ~/value.txt -
Challenge
Determine How Many Words End with the Letter "x"
- Run the following command:
cat /usr/share/dict/words | grep -E "x$" | wc -l- Send the output to
~/value.txt.
cat /usr/share/dict/words | grep -E "x$" | wc -l >> ~/value.txt -
Challenge
Determine Which Word Starts with "l", Ends in "x", and Contains 5 Characters Total
- Run the following command:
cat /usr/share/dict/words | grep -E "^l...x$"- Send the output to
~/value.txt.
cat /usr/share/dict/words | grep -E "^l...x$" >> ~/value.txt -
Challenge
Determine How Many 3-Letter Words Start with the Letters "y" or "z"
- Run the following command:
cat /usr/share/dict/words | grep -E "^y..$|^z..$" | wc -l- Send the output to
~/value.txt.
cat /usr/share/dict/words | grep -E "^y..$|^z..$" | wc -l >> ~/value.txt
Real skill practice before real-world application
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.
Learn by doing
Engage hands-on with the tools and technologies you’re learning. You pick the skill, we provide the credentials and environment.
Follow your guide
All labs have detailed instructions and objectives, guiding you through the learning process and ensuring you understand every step.
Turn time into mastery
On average, you retain 75% more of your learning if you take time to practice. Hands-on labs set you up for success to make those skills stick.