----- Original Message ----- From: "Federico Sevilla III" <[EMAIL PROTECTED]> To: "Philippine Linux Users Group Mailing List" <[EMAIL PROTECTED]> Sent: Monday, July 19, 2004 10:08 AM Subject: Re: [plug] bash script question
> On Mon, Jul 19, 2004 at 09:50:51AM +0800, alben benavente alteza wrote: > > in a bash script, how do we add two numbers like: > > > > a=1 > > b=2 > > > > c=$a+$b > > > > echo $c > > > > my script is treating the numbers as string. > > This is more a newbie question, IMHO, so please see > <http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie>. > > Anyway, back to the topic, Bash treats all variables as strings, AFAIK. > One approach is to pipe the output to bc, an arbitrary precision > calculator, as in: > > c = `echo "$a+$b" | bc` > echo $c > > I'm sure there are many other ways of doing this, but this one works > pretty well IMO. :) either $(( EXPRESSION )) or $[ EXPRESSION] c = $(( $a + $b)) or c = $[ $a + $b] echo $c for modulo use % (percent sign) fooler. -- Philippine Linux Users' Group (PLUG) Mailing List [EMAIL PROTECTED] (#PLUG @ irc.free.net.ph) Official Website: http://plug.linux.org.ph Searchable Archives: http://marc.free.net.ph . To leave, go to http://lists.q-linux.com/mailman/listinfo/plug . Are you a Linux newbie? To join the newbie list, go to http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie
