[CentOS] another sed question...

[Thomas Johansson]

Craig White wrote:
> Looking to change a yml file (yaml is a database type file)
> 
> *** from
> --- !ruby/object:Right 
> attributes: 
>   name: Personnel Admin
>   action: index
>   id: "1"
>   controller: assessments
> --- !ruby/object:Right 
> attributes: 
>   name: Personnel Admin
>   action: find
>   id: "2"
>   controller: assessments
> 
> *** to
> --- !ruby/object:Right 
> attributes_1: 
>   name: Personnel Admin
>   action: index
>   id: "1"
>   controller: assessments
> --- !ruby/object:Right 
> attributes_2: 
>   name: Personnel Admin
>   action: find
>   id: "2"
>   controller: assessments
> 
> where I'm taking the 'id:' field from each record and inserting an
> underscore and the id into the 'attributes' label directly above.
> 
> Any takers?
> 
> Thanks
> 
> Craig
> 
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 >
I use awk instead of sed...

Reverse file order, perform changes using awk and reverse again

tac test.yml | awk '{if ($1=="id:"){idtag=substr($2,2,1)}; \
       if ($1=="attributes:") {print "attributes_"idtag":"} \
       else {print $0}}' | tac -