Monthly Archives: August 2025

Replace text in multiple files

Linux, Windows

Using find and sed a text in multiple files can be replaced using a one liner. If you have GIT bash you can do it in Windows too.

In the example below address of old.server.com will be replaced with new.server.com in all Web.config files.

find /c/inetpub/wwwroot -name "Web.config" -exec sed -i 's/old.server.com/new.server.com/g' {} +

Upgrade Debian 11 to Debian 12

Debian

I use those steps on LXC virtual in Proxmox:

  1. Make sure all packages are upgraded: apt update && apt upgrade
  2. Backup container in Proxmox
  3. Edit release version: sed -i'.bak' 's/bullseye/bookworm/g' /etc/apt/sources.list
  4. Update other configuration files in /etc/apt/sources.list.d/ appropriately
  5. Update packages index: apt update
  6. Do minimal system upgrade: apt upgrade --without-new-pkgs
  7. Do full upgrade: apt full-upgrade
  8. Restart the system: reboot

See detailed instructions here.

Yubikey FIDO2 SSH and MacOS

Mac

Even on MacOS Sequoia ssh does not support FIDO2. You need to install openssh using brew, otherwise you may get error Cannot download keys without provider when you try to import resident keys from Yubikey using ssh-keygen -K.

After you install openssh brew install openssh, restart terminal and make sure which ssh displays /opt/homebrew/bin/ssh.

Another problem that you may face, which is not related to MacOS is error Provider "internal" returned failure -1. The problem is that you may generate SSH key on Yubikey without FIDO PIN. But if you do not set FIDO PIN, you cannot import the key. Fortunately you can set the PIN later.

ykman fido access change-pin

Edit files in Altap Salamander using nano

Git, Linux, Windows

This guide is meant for those who need to work in Windows from time-to-time and would like to have linux feeling.

Prerequisites

In Altap Salamander go to Configuration -> Editors.

Command"C:\Program Files\Git\bin\bash.exe"
Arguments--login -i -c 'nano "$(Name)"'
Initial Directory$(FullPath)

Remarks

--login -i is used to start interactive shell.

-c starts a command (nano …)