HOW TO : Block outbound e-mails in Postfix
I ran into a challenge at work, where we had to allow e-mail delivery for certain domains, but block all other domains. But at the same...
Linux
HOW TO : More examples of grep
For my reference.. good article about command line usage of grep . http://arstechnica.com/open-source/news/2009/05/command-line-made-easy-five-simple-recipes-for-grep.ars . Older how to articles on my site related to this topic are...
HOW TO : Force expire sudo security permissions..
Ever run into a situation when you thought you had sudo rights on a machine and tried to issue the sudo command and upon finding that...
HOW TO : View HTML pages in Linux (command line)
If you are stuck in a terminal on a Linux workstation and need to view a html file.. you can use the following command links NAME_OF_HTML_FILE...
HOW TO : Delete duplicate lines in Linux/Unix
If you have a large text file and want to quickly delete any duplicate lines, you can use the following option of sort in *nix.. sort...
Tools of the trade : Postfix Configuration
Good link with information on configuring a custom transport link in Postfix. A transport link in a SMTP server is a way to define a communiction/delivery...