Emulating a do-while loop in Bash

Question

What is the best way to emulate a do-while loop in Bash?

I could check for the condition before entering the while loop, and then continue re-checking the condition in the loop, but that's duplicated code. Is there a cleaner way?

Pseudo code of my script:

while [ current_time <= $cutoff ]; do
    check_if_file_present
    #do other stuff
done

This doesn't perform check_if_file_present if launched after the $cutoff time, and a do-while would.

Answer 1

Two simple solutions:

1. Execute your code once before the while loop

   actions() {
      check_if_file_present
      # Do other stuff
   }
   
   actions #1st execution
   while [ current_time <= $cutoff ]; do
      actions # Loop execution
   done
   

2. Or:

   while : ; do
       actions
       [[ current_time <= $cutoff ]] || break
   done