Check What You Run
I usually try to check what software is installed and I'm running on my machine, using debian there are a few ways to check this with a few packages that come from the repository, I use checkrestart and needrestart to check after updates if the software is running need to be restarted, another really useful tool to be sure the system is running trustworthy software is debsums that make sure that your installed files have the same checksums of the files from the packages so as far you trust your debian repository you can trust your system......
Java Shell Script
Often happen that I've to write some shell/automation scripts for job or fun and most of the time i do it with bash or similar, but because my main programming language has been java, i every time wondered if could be possible do some of this script in java, i know that a lot of other languages have the support for be ran as script, like in D you can put on the top of your file #!/usr/bin/env rdmd
and that file can be compiled or just run, in case you run it it will compile itself and exec the code......