Shell script help

[Björn König]

Mike Jeays wrote:

> "man expr" to give the short answer to your first question:
> 
> As an example, x=`expr $x + 1`
> 
> 536 ~ $ x=4
> 537 ~ $ x=`expr $x + 1`
> 538 ~ $ echo $
> 
> Note the back-quotes to execute a command and return the result, and the
> need for spaces between each token in the expr command.

sh(1) is able to evaluate arithmetic expressions too, e.g.

   x=$(($x+1))



Björn