Hi,
I'm using awk for string manipulations within a (backup)bash script.
Among others I have to do some kind of substring operations using the
built-in index-function:


Docu:
index(in, find)
This searches the string in for the first occurrence of the string
find, and returns the position in characters where that occurrence
begins in the string in. For example:


awk 'BEGIN { print index("peanut", "an") }'

Of course this example works; however I want to replace both literals
with the content of local bash / environment variables like:


a= $(cat ANY_FILE);
b="anyString"

awk 'BEGIN { print index($a, $b) }'

Where I'm wrong & how can I use bash variables within built-in
functions of awk?


ThanX
/franzR
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On 30 June 2012 14:03, franz.reitinger <franz.reitinger@htl-wels.at> wrote:
> Hi,
> I'm using awk for string manipulations within a (backup)bash script. Among
> others I have to do some kind of substring operations using the built-in
> index-function:
>
> Docu:
> index(in, find)
> This searches the string in for the first occurrence of the string find, and
> returns the position in characters where that occurrence begins in the
> string in. For example:
>
> awk 'BEGIN { print index("peanut", "an") }'
>
> Of course this example works; however I want to replace both literals with
> the content of local bash / environment variables like:
>
> a= $(cat ANY_FILE);
> b="anyString"
>
> awk 'BEGIN { print index($a, $b) }'
>
> Where I'm wrong & how can I use bash variables within built-in functions of
> awk?

I am not an expert but if in a terminal I do
a = "a string"
echo $a
then I see
a string
as expected. However if I do
echo '$a'
then I see
$a

but echo "$a" shows a string. So I suggest trying double quotes in
your awk command.

Colin

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