How to flush Magento 1.9.x cache using SSH?

I have resolved the issue by myself with the following solution:

Login to your server and run the below command from your magento root directory:

php -r 'require "app/Mage.php"; Mage::app()->getCacheInstance()->flush();'

Above command flush your magento 1 cache. I suggest when change magento project folder then run above command

You may delete it from command line with the below commands

$rm -rf var/cache/*
$rm -rf var/session/*

Find full details here

(or)

Mage::app()->getCacheInstance()->flush();

A shell script is provided here to do the same.