initial script to boot qemu, run xv6, run a command within xv6, and exit

tester/run-xv6-command.sh

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+#! /usr/bin/env expect
+
+# turn off timeout (perhaps make this flexible later)
+set timeout -1
+
+# build and launch xv6 on qemu
+spawn make qemu-nox
+
+# wait for initial prompt
+expect "init: starting sh\r"
+expect "$ "
+
+# send command as per command line
+send "$argv\r"
+
+# wait for it to be done
+expect "$ "
+
+# send command to halt qemu (ctrl-a x)
+# how to do so found here:
+# https://stackoverflow.com/questions/27050473/how-to-send-ctrl-a-then-d-in-expect
+send "\x01"; send "x"
+
+# make sure to wait for it all to stop
+# (without this, script was terminating before qemu quit -> bad)
+interact
+
+
+
+
+
+
+
+