mjhjmtu

I'm having an instance of qemu running on Windows 7, running without an open terminal. Now I want to shutdown the machine with the name MyMachineName or add an USB-Device to it.
I need a scriptable solution. Libvirt is not a solution, because it has other disadvantages for my system.

Im looking for a magic line like:

qemu-monitor -connect=MyMachineName command="shutdown"

How can I do it?

Someone might be able to chime in with a proper command for operating on TTYs, but I'll post a solution in the meantime involving the network.

There are a couple options for redirecting the QEMU monitor. One way is to have QEMU offer access to its monitor via telnet:

$ qemu-system-i386 -monitor telnet:127.0.0.1:55555,server,nowait;

Then, QEMU can be scripted by piping commands to telnet. This is fine as long as the output of commands can be discarded since the telnet session will probably close too quickly for visual feedback:

$ echo system_powerdown |telnet 127.0.0.1 55555
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Connection closed by foreign host.
$ _ # qemu sends the guest an ACPI shutdown signal

If the output of the commands executed on the monitor need to be collected, a TCP session can be used instead:

$ qemu-system-i386 -monitor tcp:127.0.0.1:55555,server,nowait;

Then, commands can be sent to the listening monitor via netcat or a similar utility:

$ echo info kvm |nc -N 127.0.0.1 55555
QEMU 2.11.0 monitor - type 'help' for more information
(qemu) info kvm
kvm support: enabled
(qemu) $ echo system_powerdown |nc -N 127.0.0.1 55555
QEMU 2.11.0 monitor - type 'help' for more information
(qemu) system_powerdown
(qemu) $ # hit return
$ _ # qemu sends the guest an ACPI shutdown signal

Here is a link to partial documentation of QEMU monitor commands: https://en.wikibooks.org/wiki/QEMU/Monitor