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Pacman

Command	Meaning
pacman -S	Install package
pacman -Syy	Sync package database
pacman -Syu	Upgrade whole system
pacman -Ss	search package
pacman -R	remove package
pacman -Rs	remove package with dependencies
pacman -Runsc	remove package and all that belongs to it
pacman -Q	all installed packages
pacman -Qe	all explicitly installed packages
pacman -Qq	all installed packages without versions
pacman -Qn	packges from main repositories
pacman -Qm	all AUR packages
pacman -Qdtq	list unneeded dependencies
pacman -Qs	search for local packages
pacman -Sc	remove old packages from the cache
yay -Yc	remove unneded packages (alternatively, use `sudo pacman -Rns $(pacman -Qtdq)`)
yay -Syu --devel	upgrade all AUR packages

Uncomment the line Color in /etc/pacman.conf to add colors to the pacman output.

Troubleshooting

When getting error: failed to commit transaction (invalid or corrupted package (PGP signature)), try the following:

Make sure the system time is correct using tpd -qg followed by hwclock -w
Reset the packges cache using pacman -Sc
Reset all pacman keys
- Remove the /etc/pacman.d/gnupg directory
- Rerun pacman-key --init followed by pacman-key --populate to re-add the default keys