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Compare / diff two images
Outputs the number of different pixels. 2 params to increase tolerance: * thumbnails size * fuzz, the color distance tolerance See http://en.positon.org/post/Compare-/-diff-between-two-images for more details.

check open ports without netstat or lsof

Print only the odd lines of a file
NR%2 == 1 on odd lines and 0 on even lines

Copy one file to multiple files
Copies file.org to file.copy1 ... file.copyn

How To Display Bash History Without Line Numbers
userful for direct copy & paste command for doumenation or next using

Find usb device
I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Extract multiple tar files at once in zsh
tar doesn't support wildcard for unpacking (so you can't use tar -xf *.tar) and it's shorter and simpler than for i in *.tar;do tar -xf $i;done (or even 'for i in *.tar;tar -xf $i' in case of zsh) -i says tar not to stop after first file (EOF)

A nice command for summarising repeated information

Lets Tux say the random fact. [add it to .bashrc to see it in new terminal window]


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