diff --git a/README.md b/README.md
index f9f3d55..7e40891 100644
--- a/README.md
+++ b/README.md
@@ -2,20 +2,30 @@
 
 Useful scripts for managing servers written in Bash. Supported OS includes Debian/Ubuntu, Alpine, Arch, RHEL/Fedora/CentOS, openSUSE, Void, and Gentoo.
 
-In the past I was using it more for maintaining my home servers, bare metal with Docker, however when I changed to k3s, I started using it less. Now I'm using this as a collection of useful scripts that I can use when needed. Also `clean.sh` is still useful.
+In the past I was using it more for maintaining my home servers, bare metal with Docker, however when I changed to k3s, I started using it less. Now I'm using this as a collection of useful scripts that I can use when needed. Also `housekeeping.sh` is still useful.
 
-### `clean.sh`
+### `housekeeping.sh`
 
-This script is used to clean some of the files, docker dangling images, and docker stopped/unused containers.
+Unified system housekeeping script for package index updates, system cleanup, and oh-my-zsh updates.
 
-### `update.sh`
+Subcommands:
+- `update` - detects the running OS and updates the package index only. It does not upgrade or install packages.
+- `clean` - runs system cleanup for Docker resources, package manager caches, temporary/cache/log directories, systemd journal, thumbnails, and memory caches.
+- `omz` - updates oh-my-zsh when `omz` is installed; otherwise it skips safely.
+- `all` - runs `update`, then `clean`, then `omz`. This is the default when no subcommand is provided.
 
-Detects the running OS (Alpine, Arch, Debian/Ubuntu, RHEL/Fedora/CentOS, openSUSE, Void, Gentoo) and updates the **package list** only — it does not upgrade or install any packages. Useful for keeping package indexes fresh so that `upgrade` commands run faster later.
+The `update` subcommand supports Alpine, Arch, Debian/Ubuntu, RHEL/Fedora/CentOS, openSUSE, Void, and Gentoo family distributions.
 
 Run with `curl | bash`:
 
 ```bash
-curl -sSL https://git.ivanch.me/ivanch/server-scripts/raw/branch/main/update.sh | bash
+curl -sSL https://git.ivanch.me/ivanch/server-scripts/raw/branch/main/housekeeping.sh | bash
+```
+
+Run a specific subcommand:
+
+```bash
+curl -sSL https://git.ivanch.me/ivanch/server-scripts/raw/branch/main/housekeeping.sh | bash -s -- clean
 ```
 
 ### `windows-backup.ps1`
diff --git a/housekeeping.sh b/housekeeping.sh
index 4fbfcfb..e170edd 100644
--- a/housekeeping.sh
+++ b/housekeeping.sh
@@ -2,7 +2,6 @@
 
 # Housekeeping Script
 # Unified system maintenance: package index update, system cleanup, and oh-my-zsh update.
-# Combines the former update.sh and clean.sh into a single script with subcommand dispatch.
 
 set -euo pipefail
 
@@ -109,9 +108,9 @@ get_system_info() {
 
     # Memory info
     if [[ -f /proc/meminfo ]]; then
-        local mem_total mem_available
-        mem_total=$(grep MemTotal /proc/meminfo | awk '{print $2}')
-        mem_available=$(grep MemAvailable /proc/meminfo | awk '{print $2}')
+        local mem_total="" mem_available=""
+        mem_total=$(awk '/^MemTotal:/ {print $2; exit}' /proc/meminfo 2>/dev/null || true)
+        mem_available=$(awk '/^MemAvailable:/ {print $2; exit}' /proc/meminfo 2>/dev/null || true)
         if [[ -n "$mem_total" && -n "$mem_available" ]]; then
             info+="Memory: $((mem_available/1024))MB available of $((mem_total/1024))MB total"
         fi
@@ -120,7 +119,7 @@ get_system_info() {
     # Disk space info
     if command_exists df; then
         local disk_info
-        disk_info=$(df -h / 2>/dev/null | tail -1 | awk '{print $4 " available of " $2 " total"}')
+        disk_info=$(df -h / 2>/dev/null | awk 'NR == 2 {print $4 " available of " $2 " total"}' || true)
         if [[ -n "$disk_info" ]]; then
             info+="${info:+, }Disk: $disk_info"
         fi
@@ -495,7 +494,6 @@ cleanup_logs() {
     fi
 
     # Truncate large active log files
-    local large_logs
     while IFS= read -r -d '' logfile; do
         if [[ -f "$logfile" && -w "$logfile" ]]; then
             truncate -s 0 "$logfile" 2>/dev/null || true
@@ -774,7 +772,7 @@ main() {
             log_warning "Unknown subcommand: '${subcommand}'"
             echo
             print_usage
-            exit 0
+            exit 1
             ;;
     esac
 }