How can I do division with variables in a Linux shell?

Question

When I run commands in my shell as below, it returns an expr: non-integer argument error. Can someone please explain this to me?

$ x=20
$ y=5
$          


        

Answer 1

let's suppose

x=50
y=5

then

z=$((x/y))

this will work properly . But if you want to use / operator in case statements than it can't resolve it. In that case use simple strings like div or devide or something else. See the code