https://wiki.kptree.net/ 2026-09-23T13:14:21+00:00 https://wiki.kptree.net/ https://wiki.kptree.net/_media/wiki:dokuwiki.svg text/html 2025-08-10T12:30:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:pikvm?rev=1754829003&do=diff linux kvm ipmi pikvm bmc PiKVM I purchased a PiKVM kit in 2021, and got it operational at that time. I did not need to use it until recently, 2024-09. Basically a special 'hat' is mounted on a standard Raspberry Pi 4, the smallest memory unit type being sufficient (2 GB). The kit was complete with all the required parts, such as the hat, Raspberry PI, a case, small OLED display and various cables. The PiKVM is V3 HAT with RPi V4 2GB. text/html 2026-06-29T07:36:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:boot?rev=1782718564&do=diff linux boot uefi ventoy secure secure_boot boot tools list drives * df -h * sudo fdisk -l * lsblk flags: * -f to get more verbose output * -o to get specific output columns, use -h option to see list of column options * blkid * ls -l /dev/disk/by-id, additional list options: text/html 2024-03-09T02:45:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:ssh?rev=1709952350&do=diff linux ssh ssh-keygen ssh with key files The advantages of using SSH key-based include: * Improved security * Easier access to ssh (if password keys are not used) Clearly use of unique password encrypted keys gives best security. However if a user has access to you terminal and user password they effectively have full system access anyway. text/html 2025-02-23T05:29:59+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:builtin?rev=1740288599&do=diff shell builtin commands sh ash bash Shell Builtin Commands I just spent half a day trying to get alias working in a script to no avail. Alias is normally, if not always a so call builtin command. I have been attempting to use / learn Alpine Linux which defaults to sh/ash shell mostly builtin into Busybox. Unfortunately the bulk of shell documentation the web is based upon bash shell which is not suitable / outright incorrect with the nuances of sh/ash with busybox. Interestingly I found this … text/html 2026-03-22T01:59:49+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:linux_commands?rev=1774144789&do=diff cli commands Linux CLI Commands Various Linux CLI (Command Line Interface) Commands with examples and grouped by type File System Find specific file types * Using ls: * ls -lhaF | grep ^l # list links * ls -lhaF | grep ^d # list directories * ls -lhaF | grep ^- text/html 2025-11-14T08:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:programs?rev=1763108348&do=diff programs applications pipx flatpak Programs & Applications dpkg -l dpkg -l lists all the installed programs on a Debian apt based system. There are too many to list all and many are built in system commands. Below are some that I highlight for interest and future reference to easily find on reinstall. text/html 2025-01-18T13:48:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:iperf?rev=1737208097&do=diff linux network testing speed speed speed test testing tech notes technical Network Speed testing Use the iperf3 command to test network speeds. * iperf3 -s to start in server mode * iperf3 -c 192.168.1.10 -t 20 to test server on ip address 192.168.1.10 for 20 tries. * iperf3 -c 192.168.1.1 -t7 -b 2.5G -u 6001 * iperf3 -c 192.168.1.1 -t7 -R -b 2.5G -u 6001 text/html 2025-03-03T02:09:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:web_browsers?rev=1740967743&do=diff web browser config Web Browser Notes The purpose of reloading web page(s) and bypass the cache is to get a fresh copy of possibly outdated or corrupted files currently stored in the disk cache. You can do this as the first attempt if a normal reload doesn't seem to be giving an up to date version of a website or if you otherwise experience issues with a website. We usually advice this in case of issues: