Insert lines in a file starting from a specific line

Question

I would like to insert lines into a file in bash starting from a specific line.

Each line is a string which is an element of an array

line[0]=\"foo\"         


        

Answer 1

Or anoter one example with the sed:

echo -e "line 1\nline 2\nline 3\nline 4" > /tmp/test.py
cat /tmp/test.py
line 1
line 2
line 3
line 4

sed -i '2 a line 2.5' /tmp/test.py    # sed for inside of the file 'LINE_NUMBER append TEXT'
cat /tmp/test.py
line 1
line 2
line 2.5
line 3
line 4