I am trying to divide two var in bash, this is what I've got:
var1=3;
var2=4;
echo ($var1/$var2)
I always get a syntax error. Does anyone knows what's wrong?
I am trying to divide two var in bash, this is what I've got:
var1=3;
var2=4;
echo ($var1/$var2)
I always get a syntax error. Does anyone knows what's wrong?
shell parsing is useful only for integer division:
var1=8
var2=4
echo $((var1 / var2))
output: 2
instead your example:
var1=3
var2=4
echo $((var1 / var2))
ouput: 0
it's better to use bc:
echo "scale=2 ; $var1 / $var2" | bc
output: .75
scale is the precision required
There are two possible answers here.
To perform integer division, you can use the shell:
$ echo $(( var1 / var2 ))
0
The $(( ... ))
syntax is known as an arithmetic expansion.
For floating point division, you need to use another tool, such as bc
:
$ bc <<<"scale=2; $var1 / $var2"
.75
The scale=2
statement sets the precision of the output to 2 decimal places.
If you want to do it without bc, you could use awk:
$ awk -v var1=3 -v var2=4 'BEGIN { print ( var1 / var2 ) }'
0.75
#!/bin/bash
var1=10
var2=5
echo $((var1/var2))