Commands by ioggstream (27)

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Backup a file with a date-time stamp
1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

check open ports without netstat or lsof

How to stop MAC Address via IPTables
edit the /etc/sysconfig/iptables file and try to work whit this: -A INPUT -i (interface) -m mac (mac address) -j ACCEPT/DROP

intersection between two files

search for a file in PATH
Also searches for aliases and shell builtins

monitor network traffic and throughput in real time
see http://iptraf.seul.org/ for all kinds of documentation and screenshots

List of computers not logged into in more than four weeks

Say something out loud
Whatever arguments you pass will be spoken out loud. (Put it in a script or shell function.)

List your largest installed packages (on Debian/Ubuntu)


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