Bash Scripting - Conditionals
You want to write a bash script that prints "Valid" only if a variable age is between 18 and 30 inclusive. Which condition correctly checks this?
You want to write a bash script that prints "Valid" only if a variable age is between 18 and 30 inclusive. Which condition correctly checks this?
hard🚀 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the range condition
We want age >= 18 and age <= 30 inclusive, so both conditions must be true.Step 2: Analyze each option
[ $age -ge 18 -a $age -le 30 ] uses -a inside single [ ], which is valid but less recommended. [ $age -gt 18 -o $age -lt 30 ] uses -o (or), which is wrong. [ $age -ge 18 ] && [ $age -le 30 ] uses two separate [ ] with &&, which is correct and clear. [ $age -gt 18 -a $age -lt 30 ] uses > and < (not inclusive) and -a inside [ ].Final Answer:
[ $age -ge 18 ] && [ $age -le 30 ] -> Option CQuick Check:
Use && with separate [ ] for clear inclusive range [OK]
Quick Trick: Use && with separate [ ] for AND conditions [OK]
Common Mistakes:
MISTAKES- Using -o (OR) instead of AND
- Using > and < instead of -ge and -le
- Combining multiple conditions inside one [ ] with -a (less clear)
Master "Conditionals" in Bash Scripting
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