in reply to Insert lines into specific stanza line

A sed solution,

sed  '/<\/stanza>/i\extra line1\nline2\nline3' filename

OUTPUT
<stanza 12.34.56.78>
    sl1  this is my line
    sl2  justanotherline
extra line1
line2
line3
</stanza>

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~suhail

In Section Seekers of Perl Wisdom