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gistfile1.txt

#!/bin/bash -e

regex='^(\[.*\]) (\[.*\]) ([^ ]+) ([^ ]+) \((.*) -> (.*)\)$'

prepare()
{
    while read str
    do
        date=$(echo $str | sed -r "s|$regex|\1|")
        db=$(echo $str | sed -r "s|$regex|\2|")
        action=$(echo $str | sed -r "s|$regex|\3|")
        pkg=$(echo $str | sed -r "s|$regex|\4|")
        v1=$(echo $str | sed -r "s|$regex|\5|")
        v2=$(echo $str | sed -r "s|$regex|\6|")
        ls /var/cache/pacman/pkg/${pkg}-${v1}*.pkg.tar.xz
    done
}

pacman -U "$(grep $1 /var/log/pacman.log | grep upgraded | prepare)"