diff --git a/host/libs/vm_manager/cf_qemu.sh b/host/libs/vm_manager/cf_qemu.sh
index 1b9e184..ba45ffa 100644
--- a/host/libs/vm_manager/cf_qemu.sh
+++ b/host/libs/vm_manager/cf_qemu.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #
 # Copyright (C) 2018 The Android Open Source Project
@@ -34,48 +34,55 @@
     exit 1
 fi
 
-exec "${qemu_binary=/usr/bin/qemu-system-x86_64}" \
-    -enable-kvm \
-    -name "guest=${instance_name=${default_instance_name}},debug-threads=on" \
-    -machine "pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-core=off" \
-    -m "${memory_mb=2048}" \
-    -realtime mlock=off \
-    -smp "${cpus=2},sockets=${cpus=2},cores=1,threads=1" \
-    -uuid "${uuid=${default_uuid}}"\
-    -display none \
-    -no-user-config \
-    -nodefaults \
-    -chardev "socket,id=charmonitor,path=${monitor_path=${default_dir}/qemu_monitor.sock},server,nowait" \
-    -mon "chardev=charmonitor,id=monitor,mode=control" \
-    -rtc "base=utc" \
-    -no-shutdown \
-    -boot "strict=on" \
-    -kernel "${kernel_image_path=${HOME}/kernel}" \
-    -initrd "${ramdisk_image_path=${HOME}/ramdisk.img}" \
-    -append "${kernel_args="loop.max_part=7 console=ttyS0 androidboot.console=ttyS1 androidboot.hardware=vsoc enforcing=0 audit=1 androidboot.selinux=permissive mac80211_hwsim.radios=0 security=selinux buildvariant=userdebug  androidboot.serialno=CUTTLEFISHCVD01 androidboot.lcd_density=160"}" \
-    -dtb "${dtb_path=${HOME}/config/cuttlefish.dtb}" \
-    -device "piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2" \
-    -device "virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x3" \
-    -drive "file=${system_image_path=${HOME}/system.img},format=raw,if=none,id=drive-virtio-disk0,aio=threads" \
-    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1" \
-    -drive "file=${data_image_path=${HOME}/userdata.img},format=raw,if=none,id=drive-virtio-disk1,aio=threads" \
-    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1" \
-    -drive "file=${cache_image_path=${HOME}/cache.img},format=raw,if=none,id=drive-virtio-disk2,aio=threads" \
-    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk2,id=virtio-disk2" \
-    -drive "file=${vendor_image_path=${HOME}/vendor.img},format=raw,if=none,id=drive-virtio-disk3,aio=threads" \
-    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk3,id=virtio-disk3" \
-    -netdev "tap,id=hostnet0,ifname=${mobile_tap_name=${default_mobile_tap_name}},script=no,downscript=no" \
-    -device "virtio-net-pci,netdev=hostnet0,id=net0,bus=pci.0,addr=0x2" \
-    -chardev "socket,id=charserial0,path=${kernel_log_socket_name=${default_dir}/kernel-log}" \
-    -device "isa-serial,chardev=charserial0,id=serial0" \
-    -chardev "socket,id=charserial1,path=${console_path=${default_dir}/console},server,nowait" \
-    -device "isa-serial,chardev=charserial1,id=serial1" \
-    -chardev "file,id=charchannel0,path=${logcat_path=${default_dir}/logcat},append=on" \
-    -device "virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=cf-logcat" \
-    -device "virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8" \
-    -object "rng-random,id=objrng0,filename=/dev/urandom" \
-    -device "virtio-rng-pci,rng=objrng0,id=rng0,max-bytes=1024,period=2000,bus=pci.0,addr=0x9" \
-    -chardev "socket,path=${ivshmem_qemu_socket_path=${default_dir}/ivshmem_socket_qemu},id=ivsocket" \
-    -device "ivshmem-doorbell,chardev=ivsocket,vectors=${ivshmem_vector_count}" \
-    -cpu host \
+args=(
+    -enable-kvm
+    -name "guest=${instance_name:-${default_instance_name}},debug-threads=on"
+    -machine "pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-core=off"
+    -m "${memory_mb:-2048}"
+    -realtime mlock=off
+    -smp "${cpus:-2},sockets=${cpus:-2},cores=1,threads=1"
+    -uuid "${uuid:-${default_uuid}}"
+    -display none
+    -no-user-config
+    -nodefaults
+    -chardev "socket,id=charmonitor,path=${monitor_path:-${default_dir}/qemu_monitor.sock},server,nowait"
+    -mon "chardev=charmonitor,id=monitor,mode=control"
+    -rtc "base=utc"
+    -no-shutdown
+    -boot "strict=on"
+    -kernel "${kernel_image_path:-${HOME}/kernel}"
+    -append "${kernel_args:-"loop.max_part=7 console=ttyS0 androidboot.console=ttyS1 androidboot.hardware=vsoc enforcing=0 audit=1 androidboot.selinux=permissive mac80211_hwsim.radios=0 security=selinux buildvariant=userdebug  androidboot.serialno=CUTTLEFISHCVD01 androidboot.lcd_density=160"}"
+    -dtb "${dtb_path:-${HOME}/config/cuttlefish.dtb}"
+    -device "piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2"
+    -device "virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x3"
+    -drive "file=${system_image_path:-${HOME}/system.img},format=raw,if=none,id=drive-virtio-disk0,aio=threads"
+    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1"
+    -drive "file=${data_image_path:-${HOME}/userdata.img},format=raw,if=none,id=drive-virtio-disk1,aio=threads"
+    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1"
+    -drive "file=${cache_image_path:-${HOME}/cache.img},format=raw,if=none,id=drive-virtio-disk2,aio=threads"
+    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk2,id=virtio-disk2"
+    -drive "file=${vendor_image_path:-${HOME}/vendor.img},format=raw,if=none,id=drive-virtio-disk3,aio=threads"
+    -device "virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk3,id=virtio-disk3"
+    -netdev "tap,id=hostnet0,ifname=${mobile_tap_name:-${default_mobile_tap_name}},script=no,downscript=no"
+    -device "virtio-net-pci,netdev=hostnet0,id=net0,bus=pci.0,addr=0x2"
+    -chardev "socket,id=charserial0,path=${kernel_log_socket_name:-${default_dir}/kernel-log}"
+    -device "isa-serial,chardev=charserial0,id=serial0"
+    -chardev "socket,id=charserial1,path=${console_path:-${default_dir}/console},server,nowait"
+    -device "isa-serial,chardev=charserial1,id=serial1"
+    -chardev "file,id=charchannel0,path=${logcat_path:-${default_dir}/logcat},append=on"
+    -device "virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=cf-logcat"
+    -device "virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8"
+    -object "rng-random,id=objrng0,filename=/dev/urandom"
+    -device "virtio-rng-pci,rng=objrng0,id=rng0,max-bytes=1024,period=2000,bus=pci.0,addr=0x9"
+    -chardev "socket,path=${ivshmem_qemu_socket_path:-${default_dir}/ivshmem_socket_qemu},id=ivsocket"
+    -device "ivshmem-doorbell,chardev=ivsocket,vectors=${ivshmem_vector_count}"
+    -cpu host
     -msg "timestamp=on"
+)
+
+if [[ -n "${ramdisk_image_path}" ]]; then
+  args+=(-initrd "${ramdisk_image_path}")
+fi
+
+exec "${qemu_binary=/usr/bin/qemu-system-x86_64}" \
+  "${args[@]}"