"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk?

As long as you are running a post 2.6.16 kernel,..."

Source: http://ubuntuforums.org/showpost.php?p=3621283&postcount=1

This is a little trickier than finding the last Sunday, because you know the last Sunday is in the first position of the last line. The trick is to use the NF less than or equal to 7 so it picks up all the lines then grep out any empty lines.

simple way to show free swap

trying to copy all your dotfiles from one location to another, this may help

Currently Facebook has updated their headers to display 127.0.0.1 but if you have saved e-mails from messages and FB related mail you can still reveal the IP. :)

Tested on Mac OS X 10.6.3

SImply type "cd" and press enter

-t option tells the system to look for a msdos filesystem

The /dev/fd0 is your floppy drive ( This may be different for you check /dev folder to confirm)

/mnt/floppy is the point where you want to mount the device to

Shorter

Download a bunch of random animated gifs from http://gifbin.com/

repeat a command every X seconds , output show the creation of partition image using fsarchiver, each line show the size of the image.

Run GUI apps on another machine remotely through SSH.

-C is for data compression and -X enables X11 forwarding.

Take a folder full of files and split it into smaller folders containing a maximum number of files. In this case, 100 files per directory.

find creates the list of files

xargs breaks up the list into groups of 100

for each group, create a directory and copy in the files

Note: This command won't work if there is whitespace in the filenames (but then again, neither do the alternative commands :-)

With a lolcat favicon if you access it from your browser

echo "ls" > script.bash;

This is my script, a simple 'ls'.

gpg -c script.bash;

Here I encrypt and passord-protect my script. This creates file script.bash.gpg.

cat script.bash.gpg | gpg -d --no-mdc-warning | bash

Here I open file script.bash.gpg, decrypt it and execute it.

self explanatory see sample output

Crop several images by imagemagik's convert command. substitute , ,, with pixel value and with a different existent directory.

but you can't see the colors in that sample output :(