Bash: How to end infinite loop with any key pressed?

Question

I need to write an infinite loop that stops when any key is pressed.

Unfortunately this one loops only when a key is pressed.

Ideas please?

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Answer 1

Here is another solution. It works for any key pressed, including space, enter, arrows, etc.

The original solution tested in bash:

IFS=''
if [ -t 0 ]; then stty -echo -icanon raw time 0 min 0; fi
while [ -z "$key" ]; do
    read key
done
if [ -t 0 ]; then stty sane; fi

An improved solution tested in bash and dash:

if [ -t 0 ]; then
   old_tty=$(stty --save)
   stty raw -echo min 0
fi
while
   IFS= read -r REPLY
   [ -z "$REPLY" ]
do :; done
if [ -t 0 ]; then stty "$old_tty"; fi

In bash you could even leave out REPLY variable for the read command, because it is the default variable there.