diff --git a/bin/qemush b/bin/qemush
new file mode 100755
index 0000000..b1ce775
--- /dev/null
+++ b/bin/qemush
@@ -0,0 +1,124 @@
+#!/bin/bash
+
+exec_as() {
+    local user
+    user="$1"
+    shift
+
+    if [ "$(whoami)" != "$user" ]; then
+        exec sudo -u "$user" "$0" "$@"
+    else
+        cd || exit
+    fi
+}
+
+exec_as qemu "$@"
+
+bin=bin
+images=images
+if [ -t 1 ]; then
+    cat=src-hilite-lesspipe.sh
+else
+    cat='cat'
+fi
+PATH="./${bin}:${PATH}"
+EDITOR="${EDITOR:-nvim}"
+alias ls='ls --color=auto'
+alias exec='exec '
+shopt -s expand_aliases
+umask 027
+
+perror() {
+    >&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$*"
+}
+
+public_help() {
+    local name
+    name="$(basename "$0")"
+    exec cat << EOF
+${name}: usage:
+  ${name} active                      - (default behaviour) list active VMs
+  ${name} start <VM name>             - start a VM
+  ${name} watch <VM name>             - attach VM screen session
+  ${name} ls                          - list available VMs
+  ${name} edit <VM name>              - edit VM launching script
+  ${name} rm <VM name>                - delete launch script
+  ${name} diskls                      - list available disk images
+  ${name} diskadd <disk name> <size>  - create a disk image
+  ${name} diskrm <disk name>          - delete disk image
+  ${name} shell                       - start a shell as user qemu
+  ${name} help                        - show this help
+EOF
+}
+
+error_usage() {
+    perror "Invalid usage"
+    >&2 public_help
+    return 1
+}
+
+public_start() {
+    local vm_name="$1"
+    shift
+
+    exec screen -S "$vm_name" "$vm_name" "$@"
+}
+
+public_watch() {
+    exec screen -dr "$1"
+}
+
+public_active() {
+    exec screen -ls
+}
+
+public_ls() {
+    echo "Available machines:"
+    exec ls "$bin"
+}
+
+diskpath() {
+    printf "%s.qcow2" "${images}/${1}"
+}
+
+public_diskadd() {
+    exec qemu-img create -f qcow2 "$(diskpath "$1")" "$2"
+}
+
+public_diskrm() {
+    exec rm -vi -- "$(diskpath "$1")"
+}
+
+public_diskls() {
+    echo "Available disks:"
+    exec ls "$images"
+}
+
+public_edit() {
+    local file="${bin}/${1}"
+    "$EDITOR" "$file"
+    exec chmod u+x "$file"
+}
+
+public_rm() {
+    exec rm -vi -- "${bin}/${1}"
+}
+
+public_shell() {
+    exec bash -i
+}
+
+public_cat() {
+    exec "$cat" "${bin}/${1}"
+}
+
+function="$1"
+shift
+
+if [ -z "$function" ]; then
+    public_active
+elif declare -F | cut -d \  -f 3- | grep '^public_' | sed 's/^public_//' | grep -q "^${function}$"; then
+    "public_${function}" "$@"
+else
+    error_usage
+fi