https://wiki.kptree.net/ 2026-09-23T14:00:29+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 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 2025-02-23T05:29:59+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 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 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 2025-01-18T13:48:17+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: text/html 2026-01-23T03:32:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:flatpak?rev=1769139150&do=diff linux flatpak snap universal package Flatpak Flatpak is a universal Linux package management system, that is more agnostic than the Linux distributions package management systems. Flatpak currently only works with a desk top environment, it is not for servers. There are other universal package management systems available. One popular example is snap, however this is from Ubuntu and seems propriety in nature. text/html 2024-03-13T13:19:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:ansible?rev=1710335941&do=diff linux ansible ansible * sudo apt install sshpass The sshpass package must be installed. * Create a file ansible.cfg in your current folder with the following contents: [defaults] host_key_checking = false * create password less login to remote machines * ssh-keygen text/html 2025-05-24T07:53:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kptree.net/tech_notes:index?rev=1748073180&do=diff Technical Notes - Index tech notes technical index Technical Notes - IndexStart page next page