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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Change prompt to MS-DOS one (joke)
This one eliminates the additional backslash at the end (which is not necessary)

Shows the torrent file name along with the trackers url
Replace * with any filename matching glob or an individual filename

Follow the most recently updated log files
This command finds the 5 (-n5) most frequently updated logs in /var/log, and then does a multifile tail follow of those log files. Alternately, you can do this to follow a specific list of log files: sudo tail -n0 -f /var/log/{messages,secure,cron,cups/error_log}

List all files in a folder in a git repository by last commit date
This lists all the files in a folder, then finds the commit date for them one by one, then sorts them from newest to oldest

send incoming audio to a Icecast server (giss.tv)
easy way to setup an "internet radio sation", pre-requisite, create an account at an icecast server, in this example, just created beforehand an account at giss.tv. Change the word password, with the respective real password you created at server. Make sure to have installed rec, oggnec, oggfwd and tee. I have a mixer connected at line in, so I can mix music and microphone. This also will produce a local recorded copy of the session, it will be called "streamdump.ogg"

list block devices
Shows all block devices in a tree with descruptions of what they are.

Fork Bomb for Windows
Quick and dirty forkbomb for all flavors of windows Do not use in production. Replace start with a command of your choice, this will just open a new command prompt and is pretty tricky to stop once started

temporarily override alias of any command
say, someone has aliased ls to 'ls --color=always' and you want to temporarily override the alias (it does not override functions)

View All Processess Cmdlines and Environments
Grabs the cmdline used to execute the process, and the environment that the process is being run under. This is much different than the 'env' command, which only lists the environment for the shell. This is very useful (to me at least) to debug various processes on my server. For example, this lets me see the environment that my apache, mysqld, bind, and other server processes have. Here's a function I use: $ aa_ps_all () { ( cd /proc && command ps -A -opid= | xargs -I'{}' sh -c 'test $PPID -ne {}&&test -r {}/cmdline&&echo -e "\n[{}]"&&tr -s "\000" " "


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