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This commit adds two major features and fixes:
1. SSH Agent Key Selection:
- Add --agentKeyIndex flag to select specific SSH agent key (0-based)
- Solves "too many authentication failures" with multiple SSH keys
- Default -1 uses all keys (backwards compatible)
- Available in dtail, dcat, dgrep, dmap commands
2. MapReduce Outfile Fixes:
- CSV files now written at every interval, not just on exit
- Proper signal handling (SIGTERM/SIGINT) with graceful shutdown
- 5-second grace period for cleanup before force exit
- Fixes issue where outfile remained as .tmp during execution
Usage:
dtail --servers host --agentKeyIndex 0 --query '...' outfile results.csv
This is particularly useful with YubiKey/hardware tokens where many
keys are loaded in the SSH agent, and for monitoring MapReduce results
in real-time as they're computed.
Co-authored-by: Cursor <cursoragent@cursor.com>
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