Does a do while loop exist?

Bash loops:

for loop

 #!/bin/bash for i in $( ls ); do echo item: $i done

while loop

 #!/bin/bash COUNTER=0 while [ $COUNTER -lt 10 ]; do echo The counter is $COUNTER let COUNTER=COUNTER+1 done

until loop

 #!/bin/bash COUNTER=20 until [ $COUNTER -lt 10 ]; do echo COUNTER $COUNTER let COUNTER-=1 done

There is no proper do ... while loop,
to create a do while loop, you just need to ensure that you enter the loop at least once; the until loop is handy for that, even though it is just the negation of the while.
--
When man points at the moon, the fool looks at the finger!