Cleaning Keys, Clearing Lines: Sed Vs Crlf

#[2025-09-03 :: Lab Note - Cleaning Keys, Clearing Lines: sed vs CRLF]

Focus

Red Core grind + tool mastery. sed, CRLF cleanup, and workflow discipline.

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🧰 Tools & Commands Explored

• sed
  • Broke down the substitution expression (s/SEARCH/REPLACE/flags).
  • Used sed -i 's/\r$//' id_rsa to strip CRLF carriage returns from SSH private keys.
  • Learned:
    • -i = in-place editing.
    • Flags like g (global), i (case-insensitive), p (print on match).
    • Anchors: ^ (start of line), $ (end of line).
  • Verified why \r$ targets Windows carriage returns and ensures Linux-compatible SSH keys.

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🔑 Key Lessons

• Ignorance isn’t weakness, it’s the entry fee.
  Each mistake opened new doors and forced real comprehension.
• In-place editing is powerful — but test first, back up before nuking.
• CRLF vs LF matters: Windows = \r\n, Linux = \n. Hidden \r breaks private keys.

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Discipline & Workflow

• Completed multiple pomodoros.
• Learned that skipping breaks drains energy — the break is part of the training, not wasted time.
• Locked in on AttackBox for efficiency (less buggy than VM).
• Posted milestone note: first Hydra password cracked → added to lab notes.

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🎯 Milestones

• ✅ Logged method and wordlist.
• ✅ Documented sed cleanup command for SSH key hygiene.

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🪜 Next Steps

• Verify file integrity visually after sed (e.g., cat -v, od).
• Push Hydra learnings into BruteIt box continuation.
• Keep refining workflow discipline with enforced breaks and cooldown rituals.

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