Day 4 of my Linux learning journey was focused on hands-on practice with core file handling and text processing commands that are commonly used in daily Linux, cloud, and DevOps work.
I learned and practiced several new commands today, focusing on how files and text are created, edited, processed, and compared directly from the terminal.
🔹 Writing Output to Files (echo, tee)
To create a file and write content while displaying it on the terminal:
echo "Hello dosto... How are you..?" | tee Myfile.txt
This approach is useful when you want to log output without hiding it from the terminal.
🔹 Editing Files with vi
To modify file content:
vi Myfile.txt
Practiced key vi operations:
- Insert mode (i)
- Save (:w)
- Save & exit (:wq)
- Exit without saving (:q!)
These skills are critical since vi is available on almost all Linux servers.
🔹 Sorting Text Data (sort)
To sort lines alphabetically:
sort Myfile.txt
sort Mail.txt
Commonly used when working with:
- Email lists
- Logs
- Structured text data
🔹 Extracting Specific Characters (cut)
To extract selected bytes from text:
cut -b 1-3 Mail.txt
Helpful for parsing usernames, IDs, or fixed-format text files.
🔹 Comparing Files (diff)
To identify differences between two files:
diff Myfile.txt Mail.txt
This command is widely used for:
- Comparing configuration files
- Auditing changes
- Troubleshooting issues
📌 Day 4 Key Learnings
- Linux text utilities are powerful when combined
- Small commands solve big problems
- File and text handling is the foundation of cloud & DevOps automation
🚀 Reflection
Day 4 was about confidence through repetition.
Practicing these commands made me more comfortable working directly on the terminal—exactly what’s needed in real server environments.
On to Day 5 with more Linux learning 🐧🚀
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