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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"

Compare copies of a file with md5
I had the problem that the Md5 Sum of a file changed after copying it to my external disk. This unhandy command helped me to fix the problem.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

find geographical location of an ip address
I save this to bin/iptrace and run "iptrace ipaddress" to get the Country, City and State of an ip address using the http://ipadress.com service. I add the following to my script to get a tinyurl of the map as well: URL=`lynx -dump http://www.ip-adress.com/ip_tracer/?QRY=$1|grep details|awk '{print $2}'` lynx -dump http://tinyurl.com/create.php?url=$URL|grep tinyurl|grep "19. http"|awk '{print $2}'

Spoof your wireless MAC address on OS X to 00:e2:e3:e4:e5:e6
If you want to check that the spoof worked, type the same command as earlier: $ifconfig en1 | grep ether Now you will see: $ether 00:e2:e3:e4:e5:e6 For the wired ethernet port: $sudo ifconfig en0 ether 00:e2:e3:e4:e5:e6

DVD-Rip
Make backups of your home DVDs easily. Other: mencoder dvd://1 -o "$targetDir/$dvdTitle.avi" -aid "$audioID" -ovc x264 -x264encopts qp=26:frameref=3:bframes=15:direct_pred=auto:cabac:weight_b:partitions=all:8x8dct:me=esa:me_range=24:subq=7:mixed_refs:trellis=2:bitrate=1000:nofast_pskip:threads=0 -oac mp3lame

Top Command in batch mode
running top command in batch mode. it is usefull if you want to redirect the output in a file.

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

FInd the 10 biggest files taking up disk space

prevent accidents and test your command with echo
if you're using wildcards * or ? in your command, and if you're deleting, moving multiple files, it's always safe to see how those wildcards will expand. if you put "echo" in front of your command, the expanded form of your command will be printed. It's better safe than sorry.


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