grep/sed/awk paragraphs or sections from lynx output for a dictionary definition

Question

I have a bash function that let's me see a word definition from Google:

defword() {
    if [ -z $2 ]; then
        header=30
    else
        header=$2
    fi
    lynx -dump "http://www.google.com/search?hl=en&q=define%3A+${1}&btnG=Google+Search" | grep -v "\[1\] Google" | grep -v "define: ${1}__" | grep -v "\[2\]IMAGES" | head -${header}
}

e.g. defword dog would display the first 30 lines of output for 'dog' and defword dog 50 would display the first 50 lines.

It occurs to me that this could be cleaner output if I can just grab the 'noun', 'verb', 'wikipedia' sections etc.

Can you suggest ways (maybe with grep or sed or awk?) that I could run say defword dog noun that will display the whole of the noun section (from the word 'noun' down to the blank line before the next section), defword dog noun 2 to display just definition 2 from the noun section (and same for 'verb' or 'adjective' if those sections are present), and defword dog wikipedia which displays the wikipedia definition that is present below noun and verb (can see that wikipedia section by doing defword dog 100 with the above function)?

Answer 1

Matching between two lines is possible with sed (https://unix.stackexchange.com/a/264977)

To match between your lines you can pipe to

  sed -n '/^   noun$/,${p;/^$/q}'

This allows your entire script to be tidied to just be

lynx -dump "http://www.google.com/search?hl=en&q=define%3A+${1}&btnG=Google+Search" | sed -n '/^   '"${2:-noun}"'$/,${p;/^$/q}'

By also using the default parameter syntax in bash (https://coderwall.com/p/s8n9qa/default-parameter-value-in-bash)