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# Arch Linux Packages
## Downgrade cached package
pacman -U /var/cache/pacman/pkg/package-version...
## Cleaning cache
paccache -r
* `-k`: how many past versions of each package to keep, defaults to 3.
* `-u`: target only uninstalled packages.
# remove all versions of uninstalled packages
paccache -ruk0
## Troubleshooting failed installations
Usually enough to update keyring:
pacman -Sy archlinux-keyring
Might need to update mirrorlist first if outdated:
sudo pacman -Sy pacman-mirrorlist
(this might put it in /etc/pacman.d/mirrorlist.pacnew, uncomment wanted mirrors
there and remove the .pacnew suffix)
## Query (-Q)
By itself, outputs all installed packages.
List packages by size:
pacman -Qi | egrep '^(Name|Installed)' \
| cut -f2 -d':' | tr '\n' ' ' \
| sed 's/B/B\n/g' | sed -e 's/^\s\+//' \
| sed -e 's/ M/M/' -e 's/ K/K/' -e 's/ B/B/' \
| sort -hk 2
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