Bash: Integer expression expected [duplicate]

Answer 1

if echo 555 230 | awk '{exit $1/$2 >= 1.5 ? 0 : 1}'
then
  # ...
fi

Answer 2

Edit:

The shortest solution that works for me:

reSum=$(expr "scale=1;555/230" | bc)

if (( `echo $reSum'>='1.5 | bc` )); then
  # anything
fi

As pointed out by shellter, [ $(expr "$reSum > 1.5" | bc) ] actually does a lexicographic comparison. So, for example, expr "2.4 > 18 | bc" // =>0.

However, (( `echo $reSum'>='1.5 | bc` )) does floating point comparison rather than strings.