Wireshark Error on the Mac

When you reboot and get this error after installing Wireshark on the mac:

"Insecure startup item disabled chmodBPF"

I always forget where the file is that needs the permissions change. So for my failing memory:

 cd /Library/StartupItems sudo chown...
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Exif from a Terminal

 It is sometimes useful to see exif information in image files. If you want to examine exif information for an image then exiftool by Phil Harvey is excellent at doing this from the commandline. If you want to quickly...

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Finding Your External IP from Linux/BSD

 If you have curl installed:

 echo "External IP:" `curl -s http://checkip.dyndns.org/ | awk '{print $6}' | cut -f 1 -d "<"` 

This comes in real handy if you move sites and have more than one route out. It...

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Disable Disk Signature Writing in Windows

 Windows default behaviour is to write to the disk signature of basic disks when they are attached/detected by windows. This can cause merry hell with iscsi volumes, especially those with existing setups. Start diskpart interactively and put in the following:

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