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, 23 September, 2021 WordPress Cron: When It’s Time to Replace WP-Cron with Server Cron Learn when traffic-triggered WP-Cron stops being good enough, how to switch to server cron safely, and how to verify scheduled WordPress work. Tags wordpress WP-CLI Linux Operations
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 Linux Flush Ubuntu’s DNS cache safely, identify the resolver actually in use, and verify website, email, or API cutovers without guessing. Tags Ubuntu Linux DNS 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
By Greg Nowak, 8 August, 2021 Linux Browser Tweaks In firefox I have enabled a couple of tweaks described here for hardware acceleration: https://askubuntu.com/questions/1216192/why-is-kubuntu-using-much-more-… Maybe more info here: https://itectec.com/ubuntu/ubuntu-why-is-kubuntu-using-much-more-cpu-th… Tags Linux