All commands

That's useful when you're doing some web scraping http://en.wikipedia.org/wiki/Web_scraping and you're trying to test your possibly fake user-agent.

./encode.sh [ h264 | xvid | theora | mpeg4 ]

This is the quick and dirty alternative ;)

The whole file will be emptied, this is equal to /dev/null > ~/.ssh/known_hosts

(follow with next command)

tail -f from.log | colorize.pl +l20:".*" &

Use with http://www.commandlinefu.com/commands/view/10031/intercept-monitor-and-manipulate-a-tcp-connection. - can use to view output of tees that send traffic to files - output will be interwoven with red for sent traffic and green for received.

get colorize.pl from http://www.flinkmann.de/71-1-Colorizepl.html

to unload Daemon, use: launchctl unload /Library/LaunchDaemons/.plist

eliminates "l" and "o" characters change length by changing 'x' here: cut -c 1-x

Values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values.

Just type man and the name of the command you want information on followed by enter.. POW!!! there you have all you need to know on the subject.

Very simple and useful, you need to change the word "directory" for your directory

This deals nicely with files having special characters in the file name (space ' or ").

Parallel is from https://savannah.nongnu.org/projects/parallel/

The preferred way for scripts (and easier to parse)

gets the last number of the mac address to use it for other stuff

I alias this as "tach":

alias tach='screen -x `screen -ls | grep Detached | cut -c -10`'

If you have several detached sessions it will just grab the first one. If you're running nested screens you can open new outer windows and run tach repeatedly to grab all the detached sessions into that one.

Kudzu is available on CentOS, used for configuring and detecting new hardware device installed, is also usefull for device listing.

Grep for a named process.

--basic --user username:password

This will authenticate your Twitter username and password

--data status=""

Send data to the API with POST HTTP form.

Useful after a complete system update (without a new kernel) when you want to know, which processes need to be restarted

For disk space constraint testing. Leaves a little space available for creating temp files, etc. Easily free up the used disk space again by deleting the dummy00 file. Can tailor the testing by building smaller 'blocks' to suit the needs of the testing.

WARNING: do not do this to the '/' (root) filesystem unless you know what you are doing... on some systems it could crash the OS.