I'm learning to make little programs in Shell and I was looking how to define a function that uses the system calculator (bc -l). I will show what i'm trying to do:
#!/bin/bash
square (){
I need help here!
}
cube (){
I need help here!
}
rectangle (){
I need help here!
}
exit (){
help
}
I need help here!
echo "Little program that computes the following:"
echo "a) Surface of a square"
echo "b) Volume of a cube"
echo "c) Surface of a rectangle"
echo "e) exit"
echo "Choose the option you want to compute"
read answer
if [ $respuesta == "a" ]
then echo "What's the side of the square"
read l`
After that line i don't now how to calll my function that "eats" the user's answer and then display the computation. The things get worst because after the computation I have to ask the user if he wants to continue or exit. If anyone could help me, i will be very grateful. Sorry about my english. I'm not a native speaker.
Is this what you are looking for?:
menu="some items to choose from:
A) something
B) something else"
sample () {
a="$1"
b="$2"
c="$3"
printf "c: %s" "$c"
echo "$a+$b" | bc
echo "$a*$b" | bc
echo "$a/$b" | bc
}
add=$(echo "2+2" | bc)
printf "Added: %s\n" "$add"
echo "$menu"
read -p "choose: " choice
case "$choice" in
A) sample "30" "5";;
B) sample "2" "2" "2";;
*) echo "not a choice";;
esac
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