#! /bin/sh
nawk '
BEGIN{
	START="'$1'"
	LAST="'$2'"
	printf("START=%d, LAST=%d\n", START, LAST)
	while ( START < LAST ){
		first = START
		second = ++START
		print "doing " first " and " second
		dat1=sprintf("%d.dat", first)
		dat2=sprintf("%d.dat", second)
		fel1=sprintf("%d.fel", first)
		fel2=sprintf("%d.fel", second)
		cmd=sprintf("grad2 -i %s %s -o %s %s", dat1, dat2, fel1,
		fel2)
		system( cmd )
		START++
	}
}'