Simple sed & awk Guide – Master Text Processing in Linux!

Publicado el: 05 agosto 2025
en el canal de: LinuxHowTo

Need to process text files quickly and efficiently? In this video, we’ll show you how to use sed and awk for common text manipulation tasks. From replacing text to calculating averages, these powerful tools are essential for any Linux user. Let’s dive into a simple guide with practical examples!

Learn:
✅ Step-by-Step Guide:
Create Test Files:
Create pets.txt:

echo -e "cat and other cat\ndog \ncat food" 〉 pets.txt

Create grades.txt:

echo -e "Alex 85\nAkira 72\nZara 90" 〉 grades.txt

Commands to Try:

Replace First Match Text Per Line (sed):

sed 's/cat/dog/' pets.txt
What it does: Changes the first "cat" to "dog" for each line.
Example output: "dog and other cat", "dog", "dog food"
Note: Use -i option to overwrite the original file.

Replace All Matches Text (sed):

sed 's/cat/dog/g' pets.txt
What it does: Replaces all occurrences of "cat" with "dog".

Get 1st Column (awk):

awk '{print $1}' grades.txt
What it does: Shows only the first column (names).
Example output: "Alex", "Akira", "Zara"

Calculate Average (awk):

awk '{sum+=$2} END {print sum/NR}' grades.txt
What it does: Averages the numbers in the second column.
Example output: 82.3333

Filter Lines (awk):

awk '$2 〉= 80' grades.txt
What it does: Shows lines where the grade is 80 or higher.
Example output: "Alex 85", "Zara 90"

✅ Quick Cheat Sheet:
Change text: sed 's/old/new/' file
Delete lines: sed '/word/d' file
Show column: awk '{print $N}' file
Sum numbers: awk '{sum+=$N} END{print sum}' file
Filter rows: awk '$N 〉 value' file

✅ Pro Tips:
Edit files directly: Use sed -i 's/old/new/' file to modify files in place.
Count lines: Use awk 'END{print NR}' file to count the number of lines.
Combine commands: Chain sed and awk for more complex processing.
Example: sed 's/cat/dog/' pets.txt | awk '{print $1}'

You can find this guide md and pdf files at this GitLab link: https://gitlab.com/hatem-badawi/linux....

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Let us know: What text processing task will you tackle first?

👉 Watch now and master sed and awk for efficient text processing!

#LinuxTips #TextProcessing #SedAwk #CommandLine #ProductivityHacks

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