1)Copy the module download link. Normaly ending with .gz.  In a Web browser, go to the module's page at drupal.org , right-click the Download link for the version you want, and copy the link location.
   2) In an SSH goto module folder of drupal
      cd www/sites/all/modules

This document is a vi cheat sheet, designed to be kept nearby while
using the vi editor. In general, vi commands follow the
convention of "one from column A and one from column B", using the two
tables below, Operators and Operands, as columns A and B.

Cron executes commands at specified intervals. These commands are called "cron jobs." Cron is available on Unix, Linux and Mac servers. Windows servers use a Scheduled Task to execute commands.

The cron command

To edit a crontab through the command line, type:

crontab -e

In the following example, the crontab command shown below will activate the cron tasks automatically on the hour:

0 * * * * wget -O - -q -t 1 http://www.indersingh.com/cron.php

# +---------------- minute (0 - 59)
# | +------------- hour (0 - 23)
# | | +---------- day of month (1 - 31)