Given filename="backup_20240615.tar.gz", how do you extract the date part (8 digits) using substring extraction?

hard🚀 Application Q9 of 15

Bash Scripting - String Operations

Given filename="backup_20240615.tar.gz", how do you extract the date part (8 digits) using substring extraction?

A${filename:7:8}

B${filename:6:8}

C${filename:7:7}

D${filename:8:8}

Step-by-Step Solution

Solution:

Step 1: Locate date substring
Date starts after "backup_" which is 7 characters, so offset is 7.
Step 2: Extract 8 characters for date
Use ${filename:7:8} to get 8 digits of date.
Final Answer:
${filename:7:8} -> Option A
Quick Check:
Offset 7 length 8 extracts date correctly [OK]

Quick Trick: Count offset carefully; length matches date digits [OK]

Common Mistakes:

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