deb-squeaky-clean

#!/usr/bin/env bash
#
# NAME
#
#   deb-squeaky-clean - clean a Debian desktop system
#
# SYNOPSIS
#
#   deb-squeaky-clean
#
# DESCRIPTION
#
#   deb-squeaky-clean clears APT's cache, removes residual
#   and broken packages, removes other temporary and/or log
#   files, etc.
#

[[ $(id -u) == 0 ]] || exec sudo -- "$0" "$@"

# Log files ------------------------------------------------------------

# Delete all old, gzipped, and rotated log files.
find /var/log -type f -name '*.gz' -delete
find /var/log -type f -name '*.[0-9]' -delete
find /var/log -type f -name '*.old' -delete

# Remove systemd log files that are older than 1 day.
# https://unix.stackexchange.com/q/130786
journalctl --vacuum-time=1d

# APT packages ---------------------------------------------------------

# Remove useless packages.
apt --yes --purge autoremove
apt --yes clean

# Purge residual packages.
IFS=$'\n' read -r -d '' -a pkgs < <(dpkg --list | grep '^rc' | cut -d ' ' -f 3)
[[ ${#pkgs[@]} == 0 ]] || dpkg --purge "${pkgs[@]}"

# Purge broken packages.
IFS=$'\n' read -r -d '' -a pkgs < <(dpkg --list | grep '^iU' | cut -d ' ' -f 3)
[[ ${#pkgs[@]} == 0 ]] || dpkg --purge "${pkgs[@]}"

# Network Manager -------------------------------------------------------

# Gets days since supplied date.
nm_days_unused() {
    if [[ "$1" == "never" ]]
    then
        echo 1000000
    else
        before=$(date -d "$1" +%s)
        today=$(date +%s)
        echo $(( (today - before) / 86400 ))
    fi
}

# Remove all WiFi connections that haven't been used in more than 180
# days.
while IFS= read -r line
do
    uuid=$(echo "$line" | sed 's/\(^[^ \t]*\).*/\1/')
    used=$(echo "$line" | sed 's/^[^ \t]*[ \t]*//;s/[ \t]*$//')
    [[ "$used" == "TIMESTAMP-REAL" ]] && continue

    if [[ $(nm_days_unused "$used") -gt 180 ]]
    then
        nmcli con delete uuid "$uuid"
    fi
done < <(nmcli --fields UUID,TIMESTAMP-REAL con show)