Linux Device Drivers 3 examples

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diff --git a/simple/simple_load b/simple/simple_load
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+#!/bin/sh
+module="simple"
+device="simple"
+mode="664"
+
+# Group: since distributions do it differently, look for wheel or use staff
+if grep '^staff:' /etc/group > /dev/null; then
+    group="staff"
+else
+    group="wheel"
+fi
+
+# invoke insmod with all arguments we got
+# and use a pathname, as newer modutils don't look in . by default
+/sbin/insmod -f ./$module.ko $* || exit 1
+
+major=`cat /proc/devices | awk "\\$2==\"$module\" {print \\$1}"`
+
+# Remove stale nodes and replace them, then give gid and perms
+# Usually the script is shorter, it's simple that has several devices in it.
+
+rm -f /dev/${device}[rn]
+mknod /dev/${device}r c $major 0
+mknod /dev/${device}n c $major 1
+chgrp $group /dev/${device}[rn] 
+chmod $mode  /dev/${device}[rn]