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Day 5: Linux File Operational Commands 🐧

Overview

Practiced 20 essential File Operational Commands hands-on on a live Ubuntu Server as part of my 100 Days DevOps & Cloud Engineering Challenge.

Commands Mastered Today

# Command Description Hands-on Example
1 basename Extracts filename from full path basename /home/user/file.txt
2 cat Display/concatenate file content cat file.txt
3 cksum Verify file integrity via CRC checksum cksum file.txt
4 cmp Compare two files byte by byte cmp file1.txt file2.txt
5 compress Compress files into .Z format compress example.txt
6 cp Copy files or directories cp file1.txt file2.txt
7 cpio Create/extract archive for backups ls | cpio -o > backup.cpio
8 csplit Split file by pattern or line number csplit file.txt /pattern/
9 cut Extract specific columns from file cut -d',' -f1 file.csv
10 diff Compare two files line by line diff a.txt b.txt
11 diff3 Compare three files simultaneously diff3 a.txt b.txt c.txt
12 echo Print text or variables to terminal echo "Hello Linux"
13 expand Convert tabs into spaces expand file.txt
14 file Identify file type (not by extension) file script.sh
15 fold Wrap long lines to specified width fold -w60 file.txt
16 head Display first 10 lines of a file head sample.txt
17 less View file content page by page less file.txt
18 join Merge two files by common field join file1.txt file2.txt
19 ln Create hard or symbolic links ln -s file.txt link.txt
20 locate Fast file search using database locate file.txt

Key Learnings

  • diff vs cmp -- diff shows line-by-line differences, cmp works byte by byte. Both have different DevOps use cases.
  • head -- shows first 10 lines by default. Extremely useful for checking log files quickly.
  • ln -s -- creates a symbolic link, works like a shortcut in Windows.
  • less -- faster than more for large files because it does not load entire file into memory.
  • locate -- much faster than find because it uses a pre-built database.
  • cksum -- used to verify file integrity after transfers, important in server environments.

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