The insert, i, and append, a, commands work the same way with just a slight difference.
The insert command inserts the specified text before the specified line or pattern.
The append command inserts the specified text after the specified line or pattern.
Let's see some examples.
Our sample 02 file will be like this:
First line Second line Third line Fourth line
To insert a line, you need to use the insert command i like this:
$ sed '2i\inserted text' myfile
To append a line, you need to use the append command a like this:
$ sed '2a\inserted text' myfile
Look at the result and check the inserted line position:
