Hidden commands ?

[Mike Marshall]

>From article <1501 at riscy.dec.com>, by graham at fuel.dec.com (kris graham):
> Try..
> 
> dd if=/dev/mem of=/dev/null bs=1024 conv=noerror

What a cool idea! It took forever on our 8810 with 114 meg though.

t. patterson (tp at decwrl.dec.com) posted this a while back - it works
in a flash:


#!/bin/sh
#    show amount of memory on machine in kilobytes
machine=vax
[ -f /bin/machine ] && {
	machine=`/bin/machine`
}
x=`echo "&physmem/D ; quit " | dbx -k /vmunix /dev/mem | tail -1 |\
	 awk '{print  $2}'`
case "${machine}" in
    vax)
	# a little bit of round-off error will creep in...
	echo `expr $x /  2` " K"
	;;
    mips)
	echo `expr $x \* 4` " K"
	;;
    *)
	exit 1
	;;
esac
exit 0