Let’s say you have a tar.gz file. For example, apache-ant-1.6.1-bin.tar.gz

# Decompress the zip file
gzip -d apache-ant-1.6.1-bin.tar.gz
# Extract the ant files in verbose mode
tar -xvf apache-ant-1.6.1-bin.tar

To capture tcpdump output

tcpdump -v -s 4096 -w capfile.cap port 25

You can then read the capfile.cap file using WireShark

If at boot time you already know that you want an interactive start, and you know during CentOS boot process pressing “I” does nothing, here’s a trick.

At the grub boot screen press “a” (without quotes) to edit parameters
Append “confirm” (without quotes) to the kernel line

If you’re RDP-ing to a Windows box and you want to restart or shut it down and only see the Log Off or Disconnect use the following trick.

For the Windows Security Dialog use these shortcut keys in the RDP session.

CTRL + ALT + END

For a forced restart from command prompt

shutdown -f -r

For a forced shutdown from command prompt.

shutdown -f -s

So you love the auto-complete feature but Firefox’s Clear Private Data deletes everything. But if you want to delete just selected entries (for example, if you had a typo in your login information etc. and want to delete just some selected entries) use the shortcut Shift+Del. On the page, click on the text field and let Firefox list appear. Use your arrow keys in the list of choices and navigate to the “bad” entry and hit Shift+Del. It will be removed.

Here’s and excellent Hello World ANT Tutorial with which you could get started with a decent looking build.xml