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Almost. Yes, the sed a command appends one or more lines of text starting on the line after the addressed line. No, the sed i command (not option) does not insert a string at the start of a line;...

Yes, you are confusing yourself and us.

In sed you do not append text to the end of a line. The sed a command appends lines of text following the current line. And, the sed i command inserts...

Assuming that you used the s (substitute) command in sed to change the empty string at the end of a line to a specific string, why not also use the s command to change occurrences of programmer to ...