Masum Reza JohnRTitor

Mount an existing LVM virtual partition/volume in an ISO

# Load the appropriate LVM modules
sudo modprobe dm-mod

# Scan the disk for LVM pools
sudo vgscan

# Found one! Now make it active

YOu can use mycli helper to get a syntax hightlighted and multiline SQL interpreter.

mycli -u masum-db -h localhost -D bookmyshow

where bookmyshow is the database name, localhost is the hostname, masum-db is the user accessing from the hostname.

Or use the traditional mariadb or mysql.

Refind is a beautiful and customisable boot manager. It can be installed easily on NixOS by a simple command.

Regular users

Run the following commands to get a shell with required components.

nix-shell -p refind efibootmgr sbsigntool

Now you can run refind-install to install the boot manager on to your EFI.

Build normal packages - x64

# x64 packages or architechture
nix build ".#hello"

# 32bit x86 packages
nix build ".#pkgsi686Linux.hello"

# 32bit x86 drivers

Home directory and env vars not set properly in su (switch user)

Use a login shell mode instead, it will initiate the client user's profile and rc scripts. It also prevents the client user shell from inheriting host env vars.

su -l example-user

Capture text from stderr

cat command using pipe | can only capture data from stdout.

Use this to capture data from stderr as well. Here less is used as pipe destination.

Sometimes after BIOS updates, Linux boot entry can be missing from Boot menu. This happens with BIOS updates auto clearing secure boot keys and EFI variables.

If using Ubuntu where Grub is used

it can be solved by mounting the EFI partition from a Windows system.

Mount the efi parition using diskpart using elevated Command Prompt
- list disk "Look for the disk, usually 0
- select disk 0
- list partition Look for a "Primary parition"
select partition 6 partition 6 in my case, but usually 0

Interactive rebase (for squash, edit/amend, reword/rename, drop/remove):

git rebase --interactive HEAD~2

After a rebase like this, always force push

git fetch upstream
git rebase upstream/master
git push --force-with-lease

Edit /etc/environment

Add GTK_USE_PORTAL=1

Save Reboot

If Plasma Desktop is used with Wayland, using Chrome PWA (web apps) icon's are not properly shown in the task manager. PWAs would show up as additional windows under Chrome main entry in the Task Manager. A solution is to enable the Chrome flag, Preferred Ozone Platform and set it to Auto or Wayland. This will make Chrome run using Wayland completely, instead of relying on XWayland, which introduces bugs like these.

Type in browser address bar in Chrome: chrome://flags/#ozone-platform-hint

On NixOS, system wide Wayland support of Electron and Chromium apps can be enabled by setting the environment var

	Needs _7zz from nixpkgs

	7zz a -tzip -pTHISISTHEPASSWORD -mem=AES256 archive.zip hello.txt

	7zz x archive.zip -pTHISISTHEPASSWORD