Pacman

Remove packages cache (recent 1 installed packages and all uninstalled packages):

# paccache -rk1 -ruk0 paccache

Removing unused packages (orphans):

# pacman -Rns $(pacman -Qtdq)

Locally sign a key:

# pacman-key --recv-keys KEY_ID
# pacman-key --lsign-key KEY_ID

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