[SOLVED] Move line starting with specific_text_a below line starting with specific_text_b

Issue

I am trying to move an existing line that starts with let's say: abc:: below an existing line that starts with id: in various md files in a folder.

Let's assume the files looked like this

(file 1)
 text
 id: 123
 more text
 abc:: cba

(file 2)
 text
 id: 321
 more text
 a lot more text
 abc:: def

The result of running the code should in both cases be that abc::... moves right below id:...

My assumption was, that the following code, would move the line that starts with abc:: right below the line that contains id: However, if I run the code, it runs over the files (as per edited timestamp), but changes nothing.

MWE:

find . -name '*.md' -type f -exec sed -i '' '/^id:/{
N
s/\n\(abc::.*\)/\1\
/
}' {} +

Solution

This sedcommand (executed via find's -exec) should do the trick:

find . -name '*.md' -type f -exec sed -i '' '
/^id:/,/^abc::/{
    /^id:/b
    /^abc::/{p; x; s/.//p; d;}
    ${x; s/.//p; x; p; d;}
    H; d
}' {} +

Answered By - M. Nejat Aydin

Answer Checked By - David Goodson (WPSolving Volunteer)