for ((i=0; i<10; i  ))
do 
  echo "$i"
done

i=0
while [ "$i" -lt 10 ]
do 
  echo "$i"
  i=$((i 1))
done

C-style arithmetic for loops are a Ksh/Bash feature that's not supported by POSIX sh or dash. Use a while loop with separate initialization and incrementing instead.

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