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$ shellcheck fizzbuzz.sh 

In fizzbuzz.sh line 7:
    if [ `expr $i % 3` == 0 ] && [ `expr $i % 5` == 0 ]; then
         ^-- SC2046: Quote this to prevent word splitting.
         ^-- SC2006: Use $(..) instead of legacy `..`.
          ^-- SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].
                                   ^-- SC2046: Quote this to prevent word splitting.
                                   ^-- SC2006: Use $(..) instead of legacy `..`.
                                    ^-- SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].


In fizzbuzz.sh line 9:
    elif [ `expr $i % 3` == 0 ]; then
           ^-- SC2046: Quote this to prevent word splitting.
           ^-- SC2006: Use $(..) instead of legacy `..`.
            ^-- SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].


In fizzbuzz.sh line 11:
    elif [ `expr $i % 5` == 0 ]; then
           ^-- SC2046: Quote this to prevent word splitting.
           ^-- SC2006: Use $(..) instead of legacy `..`.
            ^-- SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].