You want to match files named backup_2023-01-01.tar.gz, backup_2023-12-31.tar.gz, but not backup_2022-12-31.tar.gz. Which pattern works?

hard📝 Application Q9 of 15

Linux CLI - File and Directory Operations

You want to match files named backup_2023-01-01.tar.gz, backup_2023-12-31.tar.gz, but not backup_2022-12-31.tar.gz. Which pattern works?

Abackup_202[0-9]-??-??.tar.gz

Bbackup_2023-??-??.tar.gz

Cbackup_202[2-3]-??-??.tar.gz

Dbackup_202?-??-??.tar.gz

Step-by-Step Solution

Solution:

Step 1: Understand pattern parts
2023 is fixed, ?? matches exactly two characters (digits for month and day).
Step 2: Analyze pattern backup_2023-??-??.tar.gz
This matches files starting with backup_2023-, then any two characters, dash, any two characters, and ending with .tar.gz.
Step 3: Check other options
backup_202[0-9]-??-??.tar.gz (A) matches 2020-2029, backup_202?-??-??.tar.gz (B) matches 2020-2029, backup_202[2-3]-??-??.tar.gz (C) matches 2022-2023 including the unwanted backup_2022-12-31.tar.gz.
Final Answer:
backup_2023-??-??.tar.gz -> Option B
Quick Check:
Use fixed text plus ? for exact character count [OK]

Quick Trick: Use fixed text plus ? for exact character matches [OK]

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