$ curl cheat.sh/

 while true; do foo; sleep 2; done

# By the way, if you type it as a multiline (as you are showing) at the
# command prompt and then call the history with arrow up, you will get
# it on a single line, correctly punctuated.

 $ while true
 > do
 >    echo "hello"
 >    sleep 2
 > done
 hello
 hello
 hello
 ^C
 $ <arrow up> while true; do    echo "hello";    sleep 2; done

# [Stefano Borini] [so/q/1289026] [cc by-sa 3.0]

$

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