sendkey keys [hold_ms] -- send keys to the VM (e.g. 'sendkey ctrl-alt-f1', default hold time=100 ms)
ex) (qemu) sendkey key ctrl-alt-delete
# echo 'sendkey ctrl-alt-delete' | socat - UNIX-CONNECT:./vm1.monitor
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system_powerdown Àº VM¿¡ ACPI µ¥¸óÀÌ ±¸µ¿ÁßÀ̾î¾ßÇϸç...ÀӽùæÆíÀ¸·Î ÀÌ·±½ÄÀ¸·Î...
# (echo sendkey ctrl-alt-delete; sleep 10; echo quit) | socat - UNIX-CONNECT:./vnc/vm1.monitor
ctrl+alt+delete Å° ½ÅÈ£¸¦ ÁÖ°í....10Ãʵڿ¡...quit (Á¾·á)