By Greg Nowak , 13 August, 2026 Your AI Agent Has Shell Access. What Can It Reach? A practical guide to mapping what a shell-enabled AI agent can reach, then containing its access to files, credentials, networks, tools, and high-impact actions. Tags AI agents sandboxing Linux workflow security OpenAI API
By Greg Nowak , 26 July, 2026 Shorter TLS Certificates Expose the Renewals You Haven’t Automated Shorter TLS lifetimes make certificate renewal a frequent production workflow. Learn how to automate validation, deployment, verification, and alerts. Tags TLS ACME Certbot Linux availability
By Greg Nowak , 22 May, 2026 OpenSSH 10 Crypto Changes: Why Old SFTP Integrations Need a Cleanup Plan OpenSSH 10 removes DSA and warns on non-post-quantum key exchange. Here is how to scope SFTP cleanup without weakening every SSH connection. Tags OpenSSH SFTP SSH Linux Automation
By Greg Nowak , 10 February, 2022 Delete Files and Folders Older Than X days find /[FOLDER_NAME]/* -mtime +[OLDER_THAN_DAYS] -exec rm -rf {} \; Example deletes all files and folders in tmp folder that are older than 180 days: find /tmp/* -mtime +180 -exec rm -rf {} \; Tags bash Script Linux
By Greg Nowak , 23 September, 2021 Ubuntu Logs Journalctl and Dmesg You can see a lot of good information for debugging and fixing errors on your Ubuntu server with journalctl and dmesg journalctl --since "1 days ago" journalctl --since "10 hours ago" journalctl --since "12 hours ago" -p 3 -x --utc --no-pager dmesg | less dmesg -H --time-format iso| less Resources: https://unix.stackexchange.com/questions/50098/linux-network-troublesho… Tags Linux logistics Script
By Greg Nowak , 22 September, 2021 Bash Find and Delete Files Older Than X Days find [FOLDER_NAME]/* -prune -mtime +14 -exec rm {} \; Tags Script Linux
By Greg Nowak , 24 August, 2021 How to Flush the DNS Cache on Ubuntu—and Verify the Fix Flush Ubuntu’s DNS cache safely, identify systemd-resolved, dnsmasq or nscd, and verify website, email or API cutovers end to end. Tags Ubuntu Linux DNS systemd-resolved Operations
By Greg Nowak , 11 August, 2021 Remove whoopsie-upload sudo systemctl stop apport sudo systemctl stop whoopsie sudo systemctl disable apport sudo systemctl disable whoopsie sudo aptitude purge apport whoopsie Source: https://askubuntu.com/questions/1245078/woopsie-upload-all-process-cons… Tags Linux
By Greg Nowak , 11 August, 2021 SystemD Notes Tips and Tricks A nice little guide: https://tecadmin.net/run-shell-script-as-systemd-service/ Tags Linux Script
By Greg Nowak , 10 August, 2021 Skype For Linux Fix High CPU Consumption Possible fix: Delete the cache: ~/.config/skypeforlinux/Cache/ Skype start command: nice -n 19 rm -r ~/.config/skypeforlinux/Cache/* ; nice -n 19 /usr/bin/skypeforlinux %U skypeforlinux --disable-accelerated-video-decode=true Skype start command vanilla: /usr/bin/skypeforlinux %U Tags Linux
