How to Change a MAC Address in Linux (ip, NetworkManager and macchanger)
Change a network interface MAC address in Linux with the ip command, make it permanent with NetworkManager, or use macchanger, with tested output and the pitfalls to avoid.
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Ubuntu Stuck at Initramfs After an Update? Here’s What Fixed It
My Ubuntu laptop stopped booting after an update. Instead of the login screen I got a BusyBox shell and this: Gave up waiting for root file system device. ALERT! UUID=… does not exist. Dropping to a shell! (initramfs) I tried the older kernel from the GRUB menu and landed on the same prompt. What changed…
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Automatic WordPress Backups to Google Drive on a Docker VPS (Free, With rclone)
Nightly WordPress backups from a Docker VPS to Google Drive with rclone: database dump, files archive, retention, Drive upload, a restore test and the pitfalls (tar status 1, trash quota).
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Linux Privilege Escalation Checks: How to Audit Your Own Server
A defensive Linux privilege-escalation audit with real output: sudo rules, SUID and SGID files, capabilities, root-equivalent groups, writable cron paths and patch level.
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GDB Cheat Sheet for Sysadmins: Backtraces, Breakpoints and Core Files
A GDB cheat sheet for sysadmins with real output: reading a crash backtrace, breakpoints, watchpoints, attaching to a hung process and saving or opening core files.
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Linux File Transfer Cheat Sheet: scp, rsync, sftp, curl and netcat
A practical Linux file transfer cheat sheet: when to use scp, rsync, sftp, curl, wget, tar over ssh or netcat, with real output, resume tricks and the trailing-slash trap.
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ufw vs iptables: What Happens When Their Rules Conflict
I ran into this on a test box a while back. I had opened port 80 with ufw allow 80. Later I added iptables -A INPUT -p tcp –dport 80 -j DROP because a guide told me to. Port 80 stayed open. So I tried again, this time inserting the rule at the top of…
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“Command Not Found” in Linux: A Real Troubleshooting Checklist
Getting “bash: command not found” in Linux? A practical checklist: typos, PATH, cron and non-login shells, sudo’s secure_path, uninstall history and shadowed binaries.
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exFAT vs NTFS vs APFS/HFS+ vs ext4: Which File System to Use
NTFS, exFAT, APFS/HFS+ and ext4 compared, which operating systems can read and write each, and which to pick for USB drives, Macs and Linux servers.
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systemd for New Admins: Services You’ll Actually Touch at Work
systemd units, journals, restarts, and timers the way junior admins meet them on the job — practical, not encyclopedia.
