Bash: using sed with a variable line number, and variables in the line replacement

Question

So I have seen this question: Replace complete line getting number from variable which is pretty similar, but in my case I am trying to use multiple variables: one for the line number [lineNo], one for the text to replace [transFormatted] and the file to which it should be looking in [OUTPUT_FILE] I've tried dozens of combinations to try to get it to recognize all these variables but nothing seems to work. It's unhappy no matter which way I try. What am I doing wrong?

sed -e '${lineNo}s/.*/${transFormatted}/' < $OUTPUT_FILE

Answer 1

Single quotes inhibit parameter expansion.

sed -e "${lineNo}s/.*/$transFormatted/" < "$OUTPUT_FILE"

Answer 2

You have to use double quotes for the variables to be expanded from the shell environment.