#!/bin/bashvar0=0LIMIT=10while [ "$var0" -lt "$LIMIT" ]#      ^                    ^# Spaces, because these are "test-brackets" . . .do  echo -n "$var0 "        # -n suppresses newline.  #             ^           Space, to separate printed out numbers.  var0=`expr $var0 + 1`   # var0=$(($var0+1))  also works.                          # var0=$((var0 + 1)) also works.                          # let "var0 += 1"    also works.done                      # Various other methods also work.echoexit 0