Commands by Thierry (1)

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Rename all .jpeg and .JPG files to have .jpg extension
the "i" controls case sensitiveness. It's slightly inefficient since it uselessly renames .jpg to .jpg, but that's more than compensated by launching only one process instead of two, besides being shorter to write.

Unlock your KDE4 session remotely (for boxes locked by KDE lock utility)
Do the unlock KDE screen saver locked session with lightdm display manager used in Kubuntu 12.10 +

Recursively compare two directories and output their differences on a readable format

Watch for when your web server returns
If your web server is down, this command will periodically attempt to connect to it. If the output is blank, your server is not yet up. If you see HTML, your server is up. Obviously, you need to replace the Google URL with your web server URL... * 'watch' -- a command for re-executing a command and displaying the output * '-n 15' -- tells watch to redo the command every 15 seconds * 'curl' -- a handy utility for getting the source of a web page * '-s' -- tells curl to be silent about failing * '--connect-timeout 10' -- Try to connect for 10 seconds

Remove security limitations from PDF documents using ghostscript (for Windows)
#4345 also works under windows

Filter the output of a file continously using tail and grep
The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

cooking a list of numbers for calculation
When you've got a list of numbers each on its row, the ECHO command puts them on a simple line, separated by space. You can then substitute the spaces with an operator. Finally, pipe it to the BC program.

burn an ISO image to writable CD
Does life get much easier? Read up about wodim for an understanding of its origins in relation to the older `cdrecord` utility

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Create subdirectory and move files into it
With this form you dont need to cut out target directory using grep/sed/etc.


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