I am already able to replace a certain line number in a text file (thanks to Afrow). However, I am looking around on how to insert a certain line on a text file. I want to be able to goto to a line number and insert a line there making all the lines below it go one line down.
Example:
---before---
line1
line2
line3
---after---
line1
insertedline
line2
line3
Inserting lines in text file
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