Anyone who has never made a mistake has never tried anything new. — Albert Einstein.
Here are a few mistakes that I made while working at UNIX prompt. Some mistakes caused me a good amount of downtime. Most of these mistakes are from my early days as a UNIX admin.
The following 10 items are guidelines more than rules, that I have learned over the years doing intensive work on the IT infrastructure. These guidelines are mostly common sense and can be helpful for anybody who administers an IT system, including Linux/Windows Administrator, Network Administrator and DBA.