You have a bash array items that may be empty or have elements. You want to print "Empty" if it has zero elements, or "Count: N" where N is the number of elements. Which script snippet correctly does this?
Aif [ ${#items} -eq 0 ]; then echo "Empty"; else echo "Count: ${#items[@]}"; fi
Bif [ ${#items[@]} -eq 0 ]; then echo "Empty"; else echo "Count: ${#items[@]}"; fi
Cif [ ${#items[@]} -eq 0 ]; then echo "Empty"; else echo "Count: ${#items}"; fi
Dif [ ${#items} -eq 0 ]; then echo "Empty"; else echo "Count: ${#items}"; fi
Step-by-Step Solution
Solution:
Step 1: Check condition for empty array
Use ${#items[@]} to get the number of elements. If zero, array is empty.
Step 2: Print count correctly
Use ${#items[@]} to print the count of elements, not ${#items} which is length of first element.
Final Answer:
if [ ${#items[@]} -eq 0 ]; then echo "Empty"; else echo "Count: ${#items[@]}"; fi -> Option B
Quick Check:
Use ${#array[@]} for count in both condition and output [OK]
Quick Trick:Always use ${#array[@]} to check and print array length [OK]
Common Mistakes:
MISTAKES
Using ${#array} instead of ${#array[@]} for count
Mixing length of first element with element count
Forgetting to use [ ] in if condition
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