# global - execute command in all subdirectories

    	exec 3<&0		# save standard input
	find . -type d -print |	# print all directory names
	    while read dirname
	    do
		(cd $dirname
		exec 0<&3       # restore standard input
		"$@"            # run command
		)
	    done
	exec 3<&-		# close file descriptor