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how to use expr command to retrieve all the words before the equal sign "=" with shell script

the input was added to the last line of the file
how do i make it start on a new line?

Thanks!! :D

i tried


and it works but how do i make it a new line?

read add
sed '$ a $add' file.txt

it displayed the file and i can see the line was added
But i donno why when i opened the file to check the line was not there

i am writing a script which will let user to input a line.
i m not sure how do i add this line to the end of a txt file ?