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Screen enable/disable loggin in all windows
The command when added in screenrc enables logging all open windows by using the C-l (control-l key combination) and disable by C-o . The lines need to be added in separate lines .

list block devices
Shows all block devices in a tree with descruptions of what they are.

check open ports without netstat or lsof

My PS1
My PS1

Copy all documents PDF in disk for your home directory
I used this to copy all PDFs recursively to a selected dir

Removing images by size
Removes all png files whose geometry is not 280x190 pixels

Random quote from Borat -- no html parsing
Turns out smacie.com has a text file containing every single one of the borat quotes, each one on a newline. This makes it very convenient, as this can be done without any sed-parsing, and uses less bandwitdth! Note that borate quotes are quite offensive, much more so than "fortunes-off"!

Remove duplicate lines whilst keeping empty lines and order
Remove duplicate lines whilst keeping order and empty lines

Show UDID of iPhone
Display the serial of the iPhone (aka UDID).

Release memory used by the Linux kernel on caches
=1 --> to free pagecache =2 --> to free dentries and inodes =3 --> to free pagecache, dentries and inodes


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