useful-commands

#!/bin/bash
# don't run this, it's just for syntax highlighting

# manually importing a package key? (example)
gpg --recv-keys 5CC908FDB71E12C2

# installed yay?
yay     # sync and update arch / aur
yay -Ps # stats for installed packages
yay -Yc # clean unneeded dependencies

# remove orphans
sudo pacman -Rns $(sudo pacman -Qtdq)

# check whether you fucked up and overwrote a partition table with a filesystem
sudo blkid -p /dev/sdf1    # should return gpt details -- if it's only vfat/ext4, then you forgot the number
lsblk -f                   # look over this and make sure it's ok

# find yourself stuck in fallback shell on boot?
mount /dev/sde2 new_root    # might take some guesswork to find where your system is
ls new_root                 # verify that you mounted the right system
exit                        # continue booting
## now go and make sure your systemd-boot entry defines the root correctly!

# want to set some volume labels retroactively? (sample)
yay -S dosfstools
sudo fatlabel /dev/sde1 ESP
sudo e2label /dev/sde2 Arch

# systemd freezing at boot / no signal / black screen?
## press [e] to edit boot command, add "rescue" at the end
## if that doesn't work: press [e] and add "emergency"
## worst case scenario: replace the entire statement with "init=/bin/sh"
## in case of "emergency" shell:
modprobe igb
ip link set eth0 up
ip link set eth1 up
dhcpcd

# wanna install over ssh?
passwd
nano /etc/ssh/sshd_config # PermitRootLogin yes
systemctl start sshd

# link a systemctl service from somewhere else?
systemctl link /srv/minecraft/minecraft\@.service