[_wolfie_]

> if ((temp > 90000)); then

What is this syntax? I would have assume something like `[ $temp -gt 90000 ]` or `$((temp > 90000))`. Is the dollar here optional? Is this something bash specific?

[scbrg]

> Is this something bash specific?

Yes.

http://mywiki.wooledge.org/ArithmeticExpression#Arithmetic_C...