diff --git a/bin/qemush b/bin/qemush
index bbc04c7..ca51748 100755
--- a/bin/qemush
+++ b/bin/qemush
@@ -35,7 +35,7 @@ perror() {
 public_help() {
     local name
     name="$(basename "$0")"
-    cat << EOF
+    exec cat << EOF
 ${name}: usage:
   ${name} active                      - (default behaviour) list active VMs
   ${name} start <VM name>             - start a VM
@@ -61,20 +61,20 @@ public_start() {
     local vm_name="$1"
     shift
 
-    screen -S "$vm_name" "$vm_name" "$@"
+    exec screen -S "$vm_name" "$vm_name" "$@"
 }
 
 public_watch() {
-    screen -dr "$1"
+    exec screen -dr "$1"
 }
 
 public_active() {
-    screen -ls
+    exec screen -ls
 }
 
 public_ls() {
     echo "Available machines:"
-    ls "$bin"
+    exec ls "$bin"
 }
 
 diskpath() {
@@ -82,16 +82,16 @@ diskpath() {
 }
 
 public_diskadd() {
-    qemu-img create -f qcow2 "$(diskpath "$1")" "$2"
+    exec qemu-img create -f qcow2 "$(diskpath "$1")" "$2"
 }
 
 public_diskrm() {
-    rm -vi -- "$(diskpath "$1")"
+    exec rm -vi -- "$(diskpath "$1")"
 }
 
 public_diskls() {
     echo "Available disks:"
-    ls "$images"
+    exec ls "$images"
 }
 
 public_edit() {
@@ -99,15 +99,15 @@ public_edit() {
 }
 
 public_rm() {
-    rm -vi -- "${bin}/${1}"
+    exec rm -vi -- "${bin}/${1}"
 }
 
 public_shell() {
-    bash -i
+    exec bash -i
 }
 
 public_cat() {
-    "$cat" "${bin}/${1}"
+    exec "$cat" "${bin}/${1}"
 }
 
 function="$1"