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Inverted cowsay
It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ). Slightly more challenging is to flip a whole "cowsay". :-)

List your largest installed packages.
Calculates the size on disk for each package installed on the filesystem (or removed but not purged). This is missing the $ | sort -rn which would put the biggest packges on top. That was purposely left out as the command is slightly on the slow side Also you may need to run this as root as some files can only be checked by du if you can read them ;)

Display top 5 processes consuming CPU

Using Git, stage all manually deleted files.

increase recurively the modification time for a list of files
Increase the modification date for the files selected with the find command.

netcat as a portscanner

'Fix' a typescript file created by the 'script' program to remove control characters
attribution: Thanks to repellent on perlmonks.org source: http://www.perlmonks.org/?node_id=684459

Another way to see the network interfaces
Like many other thing in Linux ,you can see the same thing in different way.

Bind a key with a command
the -x option is for binding to a shell command

Print a row of characters across the terminal
Print a row of characters across the terminal. Uses tput to establish the current terminal width, and generates a line of characters just long enough to cross it. In the example '#' is used. It's possible to use a repeating sequence by dividing the columns by the number of characters in the sequence like this: $ seq -s'~-' 0 $(( $(tput cols) /2 )) | tr -d '[:digit:]' or $ seq -s'-~?' 0 $(( $(tput cols) /3 )) | tr -d '[:digit:]' You will lose chararacters at the end if the length isn't cleanly divisible.


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