25 Essential Linux Shell Script Examples for Beginners
This article presents 25 basic Linux shell script examples, ranging from simulating a login shell and comparing numbers to file management, process control, and network queries, providing clear illustrations to help beginners understand and apply fundamental scripting techniques in real-world tasks.
Introduction
The author shares a collection of small shell script examples, emphasizing that large programs are built from small modules and encouraging programmers to learn scripting, especially on Linux.
Code Examples
1. Simulate Linux login shell
2. Compare two numbers
3. Check if a file exists in /root/
4. Use a for loop
5. Command line input
6. Delete zero‑size files in current directory
7. Resize filesystem to 3G if files exist under /export/um_lpp_source
8. Test IP address
9. If test.log size > 0, process *.tar.gz in /opt
10. Print read content as preparation for next example
11. Read and print content from 0.sh
12. Read a.c and perform increment operation
13. Simple function without parameters
14. Pass parameters to a function
15. Create a directory
16. Get local IP address
17. Find the largest file
18. Find IP users in current subnet and redirect to ip.txt
19. Print current user
20. Case statement practice
21. Yes/No returns different structures
22. Kill a process
23. Use built‑in commands
24. Print users without passwords
25. Check if a port is already in use
Conclusion
The 25 basic script examples demonstrate how small modules combine to form larger programs, hoping to inspire readers and make their work smoother.
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