Append repeated text using sed or awk? -

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i have following config file:

servers = (   {     host = "localhost";     ...     timeout = 5;   },   {     host = "127.0.0.1";     ...     timeout = 0;   },   {     host = "example.com";     ...     timeout = 99;   }   );

i want append "index" setting @ end of each section config this:

servers = (   {     host = "localhost";     ...     timeout = 5;     index = 1;   },   {     host = "127.0.0.1";     ...     timeout = 0;     index = 2;   },   {     host = "example.com";     ...     timeout = 99;     index = 3;   }   );

how can conventional unix tools sed or awk?

this adds line index = ... after each line has timeout first word.

awk '1;$1=="timeout"{printf "    index = %d;\n", ++i}' file

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