Bash Scripting - String Operations
If
var is set to an empty string, what will echo ${var:-"default"} output?If var is set to an empty string, what will echo ${var:-"default"} output?
easy🧠 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the syntax
The expression${var:-default}returnsdefaultifvaris unset or null (empty string counts as set but null).Step 2: Check the value of
Sincevarvaris set to an empty string (which is not null), it returns the empty string.Final Answer:
empty string -> Option AQuick Check:
Empty string is treated as set, so default is not used [OK]
Quick Trick: Empty string is treated as set, so default is not used [OK]
Common Mistakes:
MISTAKES- Assuming empty string triggers default
- Confusing ${var:-default} with ${var-default}
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