Things I frequently forget...

scrub mdraid

echo check > /sys/block/md0/md/sync_action
watch cat /proc/mdstat
cat /sys/block/md0/md/mismatch_cnt

Disallow users to shut down

sudo systemd-inhibit  --who='max' --why='Updating the system. Does not take long. Please be patient.' bash -c read

Recently saved files

Clear (delete!) and disable

ln -sf /dev/null .local/share/recently-used.xbel
ln -sf /dev/null ~/.recently-used

gpg: ssh and signing

gpg --list-keys [EMAIL]
gpg --export-ssh-key [EMAIL] >
gpg --armor --export [EMAIL] > signing_key.key
# ...and add this to ~/.profile:
export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)

rj45 crossover pinout

rj45-crossover pinout

Change default browser

xdg-mime default firefox.desktop text/html
xdg-settings set default-web-browser firefox.desktop