Untitled

#!/bin/bash

# List Arch Linux packages recently added to the system
#
# Usage:
#
#     pacweek [<since>]
#
# Default interval is 1 week ago.
#
# Requires GNU date & combine from moreutils.
#

[[ $# -gt 0 ]] &&
    interval="$*" ||
    interval='1 week ago'
startd=`date -d "$interval" +%s`

parselog () {
    awk -v sd=$startd -v pat=$1 '
        {
            sub(/^\[/, "", $1)
            "date -d "$1" +%s" | getline d
        }
        d >= sd && $3 == pat { print $4 }
    ' /var/log/pacman.log 2>/dev/null |
    sort
}

combine <(parselog installed) not <(parselog removed)