[LU-19626] Expand available multiop command letters with prefix

• Type: Improvement
• Resolution: Unresolved
• Priority: Medium
• Severity: 3
• Assignee: Patrick Farrell
• Reporter: Patrick Farrell

Description

The multiop test utility uses single-letter commands (a-z, A-Z) to perform various file operations. We've used up most of the alphabet - only 4 letters remain unused (b, h, k, q). We need a way to expand beyond the current 52-command limit without breaking existing tests.

Solution:

Implement two-character prefix commands using the unused letters. A prefix letter 'q' would be followed by a second character to specify the actual command (e.g., 'qe', 'qf', 'qg', etc.). This gives us ~50 additional commands per prefix letter.

This is the only safe expansion method because all existing commands can be chained together (e.g., Oc means "open then close"), so we can't repurpose any currently-used letters as prefixes.

Finally, we reserve 'qq' as a sub-prefix, for a distant future where we need >100 multiop commands, so this solution is scalable.