Bash Scripting - Quoting and Expansion
You want to create a script that prints a greeting with a variable name that might be empty. Which is the best way to write it to avoid errors?
echo "Hello, $name!"
You want to create a script that prints a greeting with a variable name that might be empty. Which is the best way to write it to avoid errors?
hard🚀 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand variable expansion with defaults
Using ${name:-Guest} provides a default if name is empty.Step 2: Analyze other options
Single quotes prevent expansion; no quotes risk word splitting; escaping prints literal.Final Answer:
Use double quotes and default value: echo "Hello, ${name:-Guest}!" -> Option CQuick Check:
Default value with double quotes avoids errors = C [OK]
Quick Trick: Use ${var:-default} inside double quotes for safe defaults [OK]
Common Mistakes:
MISTAKES- Using single quotes which prevent expansion
- Not handling empty variables
- Escaping dollar sign instead of expanding
Master "Quoting and Expansion" in Bash Scripting
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