Bash Scripting - String Operations
Given
filename="data_backup_2023.tar.gz", what does echo ${filename:5:7} output?Given filename="data_backup_2023.tar.gz", what does echo ${filename:5:7} output?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Identify offset and length
Offset is 5, length is 7, so extract 7 characters starting at index 5.Step 2: Extract substring from "data_backup_2023.tar.gz"
Characters at positions 5 to 11 are 'b', 'a', 'c', 'k', 'u', 'p', '_', forming "backup_".Final Answer:
backup_ -> Option DQuick Check:
Substring from index 5 length 7 = "backup_" [OK]
Quick Trick: Count offset from zero; length is number of chars to extract [OK]
Common Mistakes:
MISTAKES- Extracting fewer characters than length
- Confusing offset with length
- Including extra characters
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