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 […]
Artikel in Kategorie "GNU/Linux"
Using sed or awk to ensure a specific last Line in a Text
20. August 2023 in GNU/Linux, Programmierung.
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 […]
Updated Common Prefix Notation Transformation
2. Februar 2024 in Programmierung.
This is an update to my previous article on determining the common prefixes of a set of strings (passed a sequence of lines) and printing them in common prefix notation (CPN). The problem of reconstructing strings from the original input that are complete prefixes of other input strings is addressed. The code is now in […]
Find Files by Size given in Bytes
20. August 2023 in Administration, GNU/Linux, Programmierung.
Some examples: Find files in current directory that have a size of 400 bytes or more: sfind -min 400 Find files in /etc that have a size of 50 kilobytes (1 kilobyte = 1024 bytes) or more: sfind -dir /etc -min 50k Find files in /var with size between 100 and 500 megabytes, suppress warnings, […]
Print XDG Desktop Definition for Application
20. August 2023 in Administration, GNU/Linux.
For an application given by „application name“ or „executable name“, output the corresponding .desktop file, if any: #!/bin/sh IFS=“:“ xdg_data_dirs=${XDG_DATA_DIRS:-/usr/local/share:/usr/share} search=$1 for i in $xdg_data_dirs ; do a=“$i/applications“ [ -d $a ] && for d in „$a“/*.desktop ; do grep -q -e „^Name=.*$search“ -e „^Exec=.*$search“ „$d“ && { echo „# $d:“ grep -Ev ‚^(Comment|GenericName|Keywords|Name\[)‘ „$d“ […]
Transforming Sets of Strings to their Common Prefix Notation
2. Februar 2024 in Programmierung.
Update Aug 20 2022: There is an update to this article that fixes a known issue. There is also a Git repository containing a reference implementation. Any two strings s1, s2 have a common prefix cp, which is the string of characters that s1 and s2 have in common up from the start. If s1, […]