bash - script to Change ip address format, -

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i'm trying write bash script convert ip address cidr quad-style.

for example

192.168.1.1/24 ===>192.168.1.1 255.255.255.0

i tried write 

#!/bin/bash echo "enter ip" read ip b=`echo $ip | cut -d/ -f1` a=`echo $ip | cut -d/ -f2`  if a=24 ; echo "$b 255.255.255.0" fi if a=25; echo "$b 255.255.255.128" fi

i'm getting output: 

1.1.1.1 255.255.255.0 1.1.1.1 255.255.255.128

when i'm entering /24 or /25 /26 didn't wrote in if condition, i'm getting same output, wrong in script?

in bash can use

if (( == 24 ));

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