I need to write a script that will add a line to a text file if Enter is pressed.But, if Ctrl+D is pressed, I need to exit that loop in the bash.touch texttest.txtLINE=0while true; do    read LINE;    if [ $LINE == ^D ]; then            break    else            echo $LINE >> texttest.txt    fidoneCurrently have something like this but cannot figure out how I am do exit the while loop when Ctrl+D is pressed instead of Enter. 
Bash Script using read needs to stop executing on Ctrl+D
bash;shell script;input;read
You're overthinking it. All you need is this:cat > texttest.txtCat will read from STDIN if you've not told it different. Since it's reading from STDIN, it will react to the control character Ctrl+D without your having to specify it.  And since Ctrl+D  is the only thing that will finish the cat subprocess, you don't even need to wrap it in a loop.