command line

If you find that someone has done a recursive chmod or chown on a server, don’t fret.

One of the nifty things about FreeBSD’s kernel is that it will limit closed port RST responses, which, in layman’s terms, just means that if someone repeatedly hits a port that’s closed, the kernel won’t respond to all of the requests.

I found myself pretty darned frustrated when my arrow keys didn’t work in iTerm in vi/vim or other ncurses-based applications.

Installing snort from ports on FreeBSD is pretty straightforward, but there are some ‘gotchas’ that you need to be aware of.

If Redhat, CentOS, Fedora, or any other similar OS provides the following error:

If up2date throws some horrible Python errors and rpm says “rpmdb: Lock table is out of available locker entries”, you can restore your system to normality with the following:

If you ever need to communicate with a POP3 server via telnet to test it, here’s some commands you can use:

To pretty much completely disable SSH timeouts, simply adjust the following directives in /etc/ssh/sshd_config:

Before you upgrade Plesk, it’s always a good idea to make a backup and also make your ip and shell maps:

If you have too many files to remove, try this trick:

First, you have to get the certificate and key out of Windows in a pfx (PKCS #12) format.

If you need Redhat DST change information, you can get it here.

As you may or may not know, there’s new Daylight Savings Time changes in 2007.

If you’ve ever worked on a linux system, chances are that you’ve used chmod many times.

LVM is handy when you want additional flexibility to grow or shrink your storage space safely without impacting filesystems negatively.

Okay, so we know it’s easy to measure web, ftp and mail traffic, right?

You can delete them based on what they’re doing:

Check for a SYN flood:

If you have a Cisco device logging to RHEL, here’s all that’s necessary:

If you have a ton of files in a directory and you need to remove them, but rm says that the “argument list [is] too long”, just use find and xargs: