2023

4.2.2023

• Norm the linebreaks

 :%norm! gww

3.2.2023

• Remove background noise

 ffmpeg -i in.mp3 -af "afftdn=nr=10:nf=-30:tn=1" out.mp3

26.1.2023

• Grep in Apache Log file

 grep -ri generative . | awk '{print $1,$2,$3,":",$NF}'

12.1.2023

• Nokogiri

 Nokogiri 1.14.0 is out with YJIT support.

10.1.2023

• bisecting the Linux Kernel

 https://bugzilla.kernel.org/show_bug.cgi?id=216859

9.1.2023

• Flatpak Gnucash Update

 sudo flatpak update

5.1.2023

• ssh 1:9.1p1-2 throws this error after upgrade

 error: sys_get_rdomain: cannot determine VRF for fd=4 : Protocol not available

• check all ssh output with

 ssh -vvv zdavatz@domain.ch

• nine Rescue mount

 mount /dev/vda2 /mnt
 for name in proc sys dev ; do mount --bind /$name /mnt/$name; done
 mount --bind /etc/resolv.conf /mnt/etc/resolv.conf
 chroot /mnt/ /bin/bash

• show which kernel was last booted

 find /boot/vmli*
 stat -c %x /boot/vmlinuz-6.0.0-6-amd64

• show all packages via devscripts

 rmadison openssh-server

• Check network interface name

 ls /sys/class/net
 sudo lshw -C network | grep 'logical name'

• Network settings for Debian

 cat /etc/network/interfaces

4.1.2023

• Install Ruby 3.2.0 without Rdoc

 CONFIGURE_OPTS="--disable-install-rdoc" rbenv install 3.2.0

• Check for Ruby YJIT support

 $ ruby --jit -v -e itself 
 ruby 3.2.0dev (2022-06-26T06:36:14Z master c2e37c8ff7) +MJIT [x86_64-linux]

 $ ruby --yjit -e0   
 ruby: warning: Ruby was built without YJIT support

3.1.2023

• Grep or non UTF-8 characters:

 grep -P "[\x80-\xFF]" file
 grep -axv '.*' file.txt

2.1.2023

• Ruby 3.1.1 with YJIT makes a difference.
• Ruby 3.2.0 with yjit, Attach:Ruby3.2.pdf

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