A script. Take text from a file one line at a time, insert it exactly into a ini

Write a script taking 10 lines of text from a file, insert it exactly into a ini file between the desired tags, the ini file is large but only needs to be changed(removing or changing current line that is there) in 10 places one string in the text file a password, will needed to be encoded, with a unsalted MD5 hash of the password. After generating a, the string $1$ must be prepended to the hash. the text and ini file maybe change several times a week so the script needs to be robust