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create a simple version of ls with extended output
create a short alias for 'ls' with multi-column (-C), file type syntax additions (slashes after directories, @ for symlinks, etc... (-F), long format (-l), including hidden directories (all ./, ../, .svn, etc) (-a), show file-system blocks actually in use (-s), human readable file sizes (-h)

Block an IP address from connecting to a server
This appends (-A) a new rule to the INPUT chain, which specifies to drop all packets from a source (-s) IP address.

Make a thumbnail image of first page of a PDF.
convert is included in ImageMagick. Don't forget the [X] (where X is the page number). [0] is the first page of the PDF.

regex for turning a URL into a real hyperlink (i.e. for posting somewhere that accepts basic html)
This should work with anything://url.whatever etc etc ;)

Look for English words in /dev/urandom
Little faster alternative.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Fix VirtualBox error

urldecoding
$ echo "http%3A%2F%2Fwww.google.com" | sed -e's/%\([0-9A-F][0-9A-F]\)/\\\\\x\1/g' | xargs echo -e http://www.google.com $ Works under bash on linux. just alter the '-e' option to its corresponding equivalence in your system to execute escape characters correctly.

Share a 'screen'-session
Ater person A starts his screen-session with `screen`, person B can attach to the srceen of person A with `screen -x`. Good to know, if you need or give support from/to others.

Find the package that installed a command


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