Pacman package database backup script. I use this on my laptop. Combined with ac-check.bash

pacman-backup.bash

#!/usr/bin/env bash

set -e

OUTDIR="${HOME}/backup/pacman/$(hostname --short)"


function usage() {
cat << EOF
    $0 - backup pacman package database

    USAGE:
        -h|--help       help
        --outdir=PATH   Override output directory (default: "${OUTDIR}")
EOF
}

### Main package information backup function
function pkgbackup () {
    if [[ ! -e "${OUTDIR}}" ]] ; then
        mkdir -p "${OUTDIR}"
    fi

    (nice /usr/bin/pacman -Qqe | nice grep -vx "$(/usr/bin/pacman -Qqm)" > "${OUTDIR}/pacman-list-main")
    (nice /usr/bin/pacman -Qqem > "${OUTDIR}/pacman-list-other")
    (nice /usr/bin/tar -cjf "${OUTDIR}/pacman-database-local.tar.bz2" -C / "var/lib/pacman/local")
    exit 0
}

### Command line processing
for i in "$@"
do
case $i in
    --outdir=*)
        OUTDIR="${i#*=}"
        shift # past argument=value
    ;;
    -h|--help)
        shift
        usage
        exit 0
    ;;
    *)
        echo "Unknown Option ${i}"
        echo "Use $0 -h for usage"
        exit 2
        # unknown option
    ;;
esac
done

### Run default commands
pkgbackup