How to find IP Address from hostname in Windows Linux and Unix - Example

IP Address from hostname in Windows and Linux
How many times in a day do you have a hostname and you want to know the IP address? Hostname to IP address and IP address to hostname conversion is one of the frequent things which we need to do for many things when dealing with networking commands in Unix. For one command we need an IP address for others we need a hostname even from bash script sometimes we require a hostname and sometimes we look for an IP address.
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