Linux desktop and shell tips: Fedora, zsh, Midnight Commander, KVM

Fedora / GNOME

Decimal period instead of comma on the numpad

gsettings set org.gnome.desktop.input-sources xkb-options "['kpdl:comma']"

Source: askubuntu.com

Clean up /var/cache/PackageKit

sudo pkcon refresh force -c -1

Better font rendering in Firefox

Create ~/.fonts.conf with the configuration from this StackExchange answer.

Back up an SD card

1. Insert the card.
2. Find its device name: fdisk -l, lsblk, df.
3. Unmount it from the terminal (not with the eject button in Nautilus): umount /dev/sdb1
4. Copy the whole card to an image file:

dd bs=4M if=/dev/sdb of=nextcloud210313.img

KVM snapshots

Inside the virsh shell:

snapshot-create-as --domain f20 --name 'f20-spice'
snapshot-list f20
snapshot-revert f20 --snapshotname f20-spice

For better integration of Windows guests: spice-guest-tools

Resize all images in a directory

With ImageMagick, to 500 px wide (overwrites the files):

for file in *.jpeg; do convert $file -resize 500x $file; done

Show the hostname in the zsh prompt

Add to ~/.zshrc, on the right side:

export RPROMPT="%m"

or at the beginning of the prompt:

PROMPT="%m $PROMPT"

Midnight Commander

Use your own editor and viewer

Set the system default editor:

sudo update-alternatives --config editor

or turn off Configuration > Builtin editor and viewer in mc and add to ~/.zshrc:

export EDITOR=nvim
export VIEWER=nvim

Open files with the default macOS application

In the mc extension file:

regex/\.(.*)$
    Open=(open %f &)

Vim: replace in the whole file

:%s/foo/bar/g