how to detect enter with bash read?

Question

I have this script

while true
do
 size=`tput lines`
 size1="$(($size-15))"
 output1=$(banner)
 output2=$(getMSG)
 clear
 echo "$output1"
 echo "$output2"
 read -t 0.1 -s -n 1 -p "Message: >> $msg" msg1
 if [[ $msg1 == *"\r"* ]]; then
  msg="enter"
 else
  msg="$msg$msg1"
 fi
 sleep 0.01
done

It works fine but i need to detect if the enter key was pressed. How can i do this?? none of my attempts have worked.

I've also tried checking if it something like \n , \r or ^M in it but to no luck.

Answer 1

You can use read -N .

[STEP 101] $ v=
[STEP 102] $ read -N 1 v
    <-- Press <ENTER>
[STEP 103] $ printf '%q\n' "$v"
$'\n'
[STEP 104] $

---

According to help read :

-N nchars

return only after reading exactly NCHARS characters, unless EOF is encountered or read times out, ignoring any delimiter