Re: bash script problems

[Chris F.A. Johnson]

On Thu, 12 May 2005, Tony Jo wrote:

> Oh sorry. Didn't look at it closely enough.
>
> Thanks, that did solve most of the issues,

   What did? Please quote enough of the previous post that we can tell
   what you are referring to.

> but now I'm just wondering if the following is valid?

   Does it work?

> temp=`expr $val1 + $val2`
> $temp > file
>
> Everything besides this seems to be working fine now

   Does $temp contain a command or the result of a command? If it's a
   command, then it will work, but that's not what you have.

   You want either:

temp='expr $val1 + $val2'  ## $temp contains the literal command
$temp > file

   Or:

temp=`expr $val1 + $val2`  ## $temp contains the output of the commnd
echo "$temp" > file

   Or, since you are using bash:

temp=$(( $val1 + $val2 ))

--
    Chris F.A. Johnson                     <http://cfaj.freeshell.org>
    ==================================================================
    Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress
    <http://www.torfree.net/~chris/books/ssr.html>