#! /bin/bash
 
i=0			# Spaces before and after the = sign are not allowed!
# Make an infinite loop
while [ 1 ]		# Spaces after [ and in front of ] are obligatory
do
  i1=($i % 4)		# No spaces needed after ( and in front of ) it is allowed.
			# It improves the readability
			# Do not place spaces before and after the = sign!
  echo $i1
  ((i++))		# No spaces needed after (( and before )) it is allowed however
  if [ $i -eq 21 ]	# Spaces after [ and before ] are obligatory
			# -eq means: is equal
  then
    i=1
  fi
done			# Return to the while statement, restart the infinite loop

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