http://www.go2linux.org – You can perform simple aritmetic operations on the Linux shell command line, without using any external program. use the command expr These are the aritmetic operations. <!--break--> Add expr 1 + 2 Substract expr 2 - 1 Multiply expr 2 \* 1 Divide expr 2 / 1 Reminder of a divition expr 20 % 3 Note that for multiplication we escape the * character, with the back slash, and that the % operand gives as (HowTos)