root bin

 Note: I found sending email from command line to gmail impossible, as gmail gave this error instead:  connect to gmail-smtp-in.l.google.com...

If you are playing around with Linux, t is the best practice to do it on a virtual machine rather than your main Linux server.  One popular ...

 If you messed up with iptables, you need to clean that up: iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT ip...

  In Linux, ulimit is a built-in tool to manage resource allocation at global, group, and user levels. For a multi-user system like Linux, s...

After my IP banned by fail2ban, I could not unban it using any fail2ban-client commands but this one works. Suppose the banned IP is 1.2.3.4...

 I used to pay a hefty sum to Amazon SES to deliver my site.com emails. However I frequently got suspended because of bounce rates which exc...