Exiting a Script : $?, exit, and Modulo 256 Explained!
Learn how to exit a Bash script properly using $?, the exit command, and modulo arithmetic (0-255 exit status). Understand how exit codes work, why they wrap using modulo 256.
📌 Supplements:
Performing Maths → • performing maths Using expr, $[], and bc ...
Command Substitution → • Command Substitution in script under 2 mi...
Using Variables in Bash → • Environment vs User Variables in 3 Minutes...
Creating Your First Script File → • Create & Run Your First Script in 2 Minute...
⏰ Timestamps:
00:00 - Introduction to Exiting a Bash Script
00:15 - Understanding the $? Variable
00:50 - Exiting Script
01:26 - Using exit Command
01:49 - Why Bash Exit Codes Wrap Using Modulo 256
02:14 - My Message
💡 What You’ll Learn:
✔️ How to check exit status using $?
✔️ How to use the exit command properly
✔️ Why exit codes are limited to 0-255 using modulo arithmetic
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