In this example I wanted to create a VLAN attached to e0/1 for use with my KVM lab.  You'll notice I give this interface an IP address, this is so that I can have my ScreenOS device do all the routing / NATing / firewalling in isolated VLANs. I also create …

Every year or so I rebuild my machine and forget how to enable the ssh-askpass tool with ssh-agent from XDM display manager

cp /etc/X11/xdm/sys.xsession ~/.xession

cp ~/.xinitrc.template ~/.xinitrc

# Add ssh agent config for loading keys

if test -S "$SSH_AUTH_SOCK" -a -x "$SSH_ASKPASS"; then 
       ssh-add ~/.ssh …

I was trying to build https://github.com/systemfreund/go-libshout which wraps the C libshout library with Go.  On Linux this worked fine, but on OpenBSD this was a bit more of a challenge as cgo could not find libshout.  (install libshout with pkg_add first)

Although -lshout is specified as …

Create an inventory file

[host1.something]
[host2.something]
[group1]
group1host.something
group2host.something

Run a command on all hosts ansible -i inventory_file all -m command -a "uptime"

This specifies the inventory file (-i) run on all hosts (all) and run the command module (runs a remote command) with the module …

I was getting the following message from jack / hydogen

Cannot use real-time scheduling

To solve this I added the following to  /etc/security/limits.conf

@audio - rtprio 99
@audio - memlock 250000
@audio - nice -10

and also added myself to the audio group (sudo usermod -a -G audio jon)

In zsh you'll find zmv (autoload zmv) and in zmv it's easy to rewrite bulk files.  For example, I had some downloaded files that were something.mp3?id=8795294528 etc and wanted to cut off the cruft at the end.

zmv '(*.mp3)*' '$1'

Ever had an xml file bloated with comments? Here's a great one-liner for striping them.

tidy -quiet -asxml -xml -indent -wrap 1024 --hide-comments 1 file.xml

Thanks to http://stackoverflow.com/questions/1464697/stripout-comments-from-xml

openssl pkcs12 -export -in widgets.crt -inkey widgets.key -out widgets.p12

I use fluxbox.  Sometimes I work with multiple screens, sometimes I don't, sometimes those screen are various resolutions.

To see what screens I have available I run

xrandr -q

from there I can see what screens and what resolutions I have availble.  Then I can configure my setup with appropriately …

Here's a quick brain-dump on setting up a single user VPN as a NAT gateway for use when i'm out and about.

I used the openvpn package from epel.

Note that in these examples the: tunnel endpoint = tun0

server tunnel address = 10.99.66.2

client tunnel address = 10.99 …