Shell Script Example- Write a script to calculate BMI

Script:

#!/bin/bash

#Written by Himanshu

#set -x

read -p "enter the weight in kg:" wgt

read -p "enter the height in meter:" mtr

y=`expr "scale=2; $mtr * $mtr" | bc`

BMI=`expr "scale=2; $wgt / $y" | bc`

if [ 1 -eq "$((echo "$BMI < 18.5") | bc)" ]

then

echo "you are underweight"

elif [ 1 -eq "$((echo "$BMI > 18.5") | bc)" ] && [ 1 -eq "$((echo "$BMI < 24.5") | bc)" ]

then

echo "you are normal"

elif [ 1 -eq "$((echo "$BMI > 25") | bc)" ] && [ 1 -eq "$((echo "$BMI < 29.9") | bc)" ]

then

echo "you are overweight"

else

echo "you are obese"

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