On 2/12/2007 5:11 PM, Daniel Dalton wrote: > z=$x+$y Ah yes I worked it out... It should be: z =`expr $y + $x` BTW what does the expr mean? And why do we need to use "`"? -- Daniel Dalton http://members.iinet.net.au/~ddalton/ daniel.dalton47 at gmail.com