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 every renewal you never automated Shorter TLS lifetimes leave less room for manual handoffs and faulty deploy hooks. Build a renewal path that protects service availability. Tags TLS Linux ACME 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
