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Day 6: Linux File Operational Commands — Part 2 🐧

Overview

Completed the remaining 20 File Operational Commands hands-on on a live Ubuntu Server. This completes the full 40-command File Operations module from GeeksforGeeks.

Commands Mastered Today

# Command Description Hands-on Example
21 look Display lines starting with given string look "#include" file.c
22 more View file content page by page (basic) more sample.txt
23 mv Move or rename files/directories mv old.txt new.txt
24 od Display file in octal/other formats od file.txt
25 paste Merge files horizontally line by line paste a.txt b.txt
26 readlink Show target path of symbolic link readlink link.txt
27 rename Bulk rename files using patterns rename 's//.log/' *.txt
28 rev Reverse characters in each line rev file.txt
29 rm Delete files permanently rm file.txt
30 shred Securely delete files (unrecoverable) shred demo.txt
31 sort Sort lines alphabetically or numerically sort file.txt
32 split Split large file into smaller parts split demo.txt part_
33 tac Display file content in reverse order tac file.txt
34 tail Show last lines of a file (live monitoring) tail -f file.txt
35 tar Create/extract archive files for backup tar -cvf archive.tar files/
36 tee Write output to both file and terminal echo "Hello" | tee demo.txt
37 touch Create empty file or update timestamp touch test.txt
38 unexpand Convert spaces into tabs unexpand file.txt
39 uniq Remove duplicate lines from file uniq file.txt
40 wc Count lines, words, and characters wc file.txt

Key Learnings

  • tail -f — Live log monitoring in real time. Every DevOps Engineer uses this daily for debugging production servers.
  • rm vs shred — rm deletes file but data can be recovered. shred overwrites data multiple times — use for sensitive files.
  • tac vs cat — cat reads top to bottom, tac reads bottom to top. Useful for log analysis.
  • tar — Most important archiving tool in Linux. Used everywhere in DevOps for backups and deployments.
  • sort + uniq — Powerful combo for data processing and removing duplicates from log files.
  • tee — Great for logging pipeline output while still seeing it on screen.

Module Complete! ✅

All 40 File Operational Commands finished across Day 5 & Day 6.

Days Commands Covered
Day 5 Commands 1-20 (basename to locate)
Day 6 Commands 21-40 (look to wc)

Environment

  • OS: Ubuntu Server (AWS EC2)
  • Source: GeeksForGeeks Linux Track
  • Status: ✅ All commands practiced on live terminal

Part of my 100 Days DevOps & Cloud Engineering Challenge Follow my journey: LinkedIn