Math working on command line but not in script

Math working on command line but not in script

[Robert Mark Bram]

Howdy All!

I have a small script called maths.sh with the following code in it:

#/usr/bin/bash
count=0
echo $count
count=$(( $count + 1 ))
echo $count
count=$(( $count + 1 ))
echo $count
count=$(( $count + 1 ))
echo $count
count=$(( $count + 1 ))
echo $count

When I run the instructions directly on the command line it works ok but
when I run the script, it fails, as you can see from the following screen
dump:

$ count=0
$ echo $count
0
$ count=$(( $count + 1 ))
$ echo $count
1
$ count=$(( $count + 1 ))
$ echo $count
2
$ count=$(( $count + 1 ))
$ echo $count
3
$ count=$(( $count + 1 ))
$ echo $count
4
$ ./math.sh
0
? 0 + 1 ?
? ? 0 + 1 ? + 1 ?
? ? ? 0 + 1 ? + 1 ? + 1 ?
? ? ? ? 0 + 1 ? + 1 ? + 1 ? + 1 ?
$

Can anyone tell me what is going wrong?

Any advice would be most appreciated!

Rob
:)
:->
:-}



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Re: Math working on command line but not in script

[Brian Dessent]

Robert Mark Bram wrote:
> 
> Howdy All!
> 
> I have a small script called maths.sh with the following code in it:
> 
> #/usr/bin/bash

The features you're trying to use are bash-specific.  The above shebang
is not correct (you need a ! after the #, as in "#!/path/to/file") and
so the script is being executed not by bash but by sh which doesn't
understand the $(( foo )) syntax.

Brian

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RE: Math working on command line but not in script

[Robert Mark Bram]

Howdy Alexander!

> You misspelled the first line, should be
> #!/usr/bin/bash

Well, now I feel plain silly!

Thanks for the answer!

Rob
:)


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