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For a school assignment I need to make a BMI calculator. But it needs to work with decimals. So do any of you know how I make it, so I can type in a decimal on line 4 and 5 and get a decimal result on line 13? Am new to Linux BASH scripting, so all the help I can get will be very appreciated.

1.  #!/bin/bash
2.  clear
3.
4.  read -p "Weight in kilogram: " kg
5.  read -p "Lenght in meter: " m
6.  clear
7.
8.  let total_weight=$kg
9.  let total_lenght=$m*$m
10. let BMI=$total_weight/$total_lenght
11. clear
12.
13. echo "Ur BMI is: $BMI"
laboonmaster
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    Consider using a scripting language that has built-in typing, bash can't do floats on its own. – Panki Oct 21 '21 at 14:38
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    bash only does integer arithmetic. Read man bc and do something like bmi=$(echo "scale=2;$total_weight / $total_length" | bc). Hints: Don't use all upper case variable names (they're used for communicating with programs, "BMI" isn't bad by itself, but upper case variable names will bite you eventually. Check your spelling.Always paste your script into https://shellcheck.net, a syntax checker, or install shellcheck locally. Make using shellcheck part of your development process. – waltinator Oct 21 '21 at 14:45
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    If you have to use Bash for this assignment, work in different (smaller, integer) units. 2 metres is 2000 millimetres, 1.7 metres is 1700 mm, 1.76 metres is 1760 mm. Same for kg to grams. Fiddly, but Bash can manage those strings using built-in substitutions. Use similar scaling for the result, and remember squaring mm needs to shift the (invisible) decimal point. – Paul_Pedant Oct 22 '21 at 08:13
  • @waltinator Thank you so much for your reply. Finally found it. Thank you to everyone that tried to help me also – laboonmaster Oct 25 '21 at 18:41

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