how to compare real/float while using "AND" .(unix) -

i'm new shell scripting, have written small script check if input in specified (integer) range:

echo "enter number btw 50 , 100:"  read num  if [ $num -le 100 -a $num -ge 50 ];      echo "you in limits." else      echo "you out of limits." fi

how can check if number in real/floating range?

you can't sh/~~ksh~~¹/bash(/zsh?) -- integer arithmetic only.

you can like

if [ "$(echo "50 <= $num && $num <= 100" | bc)" = "1" ];     echo "you in limits." else     echo "you out of limits." fi

(¹ - ksh93 can floating point arithmetic)

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