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-   -   bash, (g)awk, local variables - Quoting Rules (http://www.linux-archive.org/ubuntu-user/678823-bash-g-awk-local-variables-quoting-rules.html)

Nils Kassube 06-30-2012 06:49 PM

bash, (g)awk, local variables - Quoting Rules
 
franz.reitinger wrote:
> After reading the "quoting"-rules of awk/bash I tried some different
> possibilities to access bash variables inside awk.
> The following code also works within a bash (script): (v 4.2.24)
>
> a=$(<anyFile)
> b="anyPattern"
>
> awk 'BEGIN {print index("'"$a"'","'"$b"'")}'

With so many quotes that line looks quite error prone to me. Therefore I
searched for "environment" in the gawk manual and found this solution:

export a b
awk 'BEGIN { print index(ENVIRON["a"], ENVIRON["b"]) }'


Nils

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