Linux Device Drivers 3 examples

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diff --git a/sbull/sbull_unload b/sbull/sbull_unload
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+#!/bin/sh
+module="sbull"
+device="sbull"
+
+# invoke rmmod with all arguments we got
+/sbin/rmmod $module $* || exit 1
+
+# Remove stale nodes
+rm -f /dev/${device}[a-d]* /dev/${device}
+
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