How do I make something like:

```
!#/bin/bash
if (system name == Jessie)
#script
if (system name == Wheezy)
#script
else
echo "It won't work on your Raspberry Pi version, please update"

if (kernel version == >= 4.4)
#script
if (kernel version == <= 4.4)
#script
else
echo "Bad kernel version"

```