do…while or do…until in POSIX shell script

Question

There is the well known while condition; do ...; done loop, but is there a do... while style loop that guarantees at least one execution of the block?

Answer 1

There isn't a do...while or do...until loop, but the same thing can be accomplished like this:

while true; do
  ...
  condition || break
done

for until:

until false; do
  ...
  condition && break
done