The OrangePi Zero 2 H616/1GByte is capable of running PiKVM. I find this an interesting development, because if i only want the KVM functionality, a full-blown Raspberry Pi 4 with all its CPU resources, multiple Gigabytes of RAM and peripheral devices seems somewhat of an overkill. I am aware that the latest official PiKVM, the […]
Articles in Category "GNU/Linux"
Print all indented Lines following a non-indented Line
29. April 2024 in GNU/Linux, Programmierung.
Some configuration and output text formats contain sections like the following: foo: value1 value2 bar: value 3 In this article, two scripts are presented that print all consecutive indented lines that follow a non-indented line that matches a search pattern given by a regular expression. This means, given the single argument foo and the standard […]
Maintaining Multi-Line „stat“ Formats using Bourne Again Shell
7. November 2024 in GNU/Linux, Programmierung.
The stat command from GNU core utilities features not only a –format FORMAT option but also a –printf FORMAT one, the difference being that the latter allows for backslash escapes such as \n. This allows for custom per-file report formats containing newlines, for example: stat –printf ‚Name: %n\nSize: %s Bytes\n‘ /etc/passwd If the format string […]
Make a Bourne Again Shell Script Log its Output to a File
23. November 2024 in Administration, GNU/Linux, Programmierung.
The Bourne Again Shell script presented in this article demonstrates techniques related to capturing and logging output (standard output and standard error stream) of a script into a log file while also delivering it to the regular output destinations (for example the terminal or whatever the caller has chosen to redirect to). If you are […]
Using sed or awk to ensure a specific last Line in a Text
20. August 2023 in GNU/Linux, Programmierung.
Given a file containing bytes of text with lines separated by the newline character (\n), one of these lines can be said to be „the last line of the file“; it is a sequence of bytes occurring in the file, for which holds: The sequence contains no newline character, and the sequence is followed by […]
Determine IPv4 Addresses of a Libvirt Qemu-KVM Domain
1. Juli 2023 in Administration, GNU/Linux, Technik.
In the VM, on Redhat-likes, make sure that the Qemu guest agent is installed: dnf install qemu-guest-agent On Debian-likes, execute: apt install qemu-guest-agent For Microsoft Windows guests, there are some tutorials on the web, see for example [1]. On the HV, execute: virsh qemu-agent-command –domain myvm \ ‚{„execute“:“guest-network-get-interfaces“}‘ | \ jq -r ‚ [.return[] | […]
Removing the Builtin Inline CSS from WordPress
27. August 2022 in Programmierung.
Should you – as i did – wonder why WordPress renders a bucket of inline CSS into the HTML output (such as –wp–preset–font-size–normal in <html> or –wp–preset–color–white in <body>): This is done to accomodate frontend editing with Gutenberg. If you – as i do – are not using Gutenberg frontend editing, then the following PHP […]