AWS re/Start Cohort 3: Project CloudIgnite

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What We Learned

Linux File Management

• Linux philosophy: Everything is a file — processes (/proc), hardware (/dev), regular files
• File system structure: /, /home, /root, /etc, /var, /dev, /proc, /boot, /media, /mnt
• Vim text editor: Insert (i), Command (Esc), Save (:w), Quit (:q), Save+Quit (:wq)
• File permissions: rwx (read/write/execute) for owner/group/others; numeric notation (chmod 400, chmod 600, chmod 777)
• File viewing: ls, cat, less, more, head, tail (with -f for live monitoring)
• File operations: cp, mv, rm, mkdir, touch, rmdir
• Navigation: pwd, cd, absolute vs relative paths
• Search: find (locate files), grep (search content inside files), diff (compare files)
• Links: Hard links (point to inode, survive deletion) vs Symbolic links (point to path, break on deletion)
• Lab 233: Practical exercises on EC2 via SSH — creating directories, files, copying/moving/deleting

Key CLF-C02 Connection

• chmod 400 for SSH keys on EC2 instances
• Linux permissions model maps to IAM least privilege concepts

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Daily Notes

• April 13 — Linux File Management (Vim, permissions, commands, hard/symbolic links)