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Print Memory Utilization Percentage For a specific process and it's children
Change the name of the process and what is echoed to suit your needs. The brackets around the h in the grep statement cause grep to skip over "grep httpd", it is the equivalent of grep -v grep although more elegant.

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

Launch a game, like Tetris, when apt-get installing an app larger than 50 Megabytes
Change the APP variable's value to whatever you want to install. Depending on how fast your machine is, you'll want to adjust the value 50 to something else. You might also want to play a different game than Gnometris - just make sure it's a GUI game.

Assign top-level JSON entries to shell variables
A recursive version might be useful too. /dev/tty is used to show which shell variables just got defined.

Sort netflow packet capture
Sort netflow packet capture by unique connections excluding source port.

Download Video & extract only a specific Time of it

ls not pattern
Hides some entries from listing.

Convert files from DOS line endings to UNIX line endings
Here "^M" is NOT "SHIFT+6" and "M". Type CTRL+V+M to get it instead. Its shortest and easy. And its sed!, which is available by default in all linux flavours.. no need to install extra tools like fromdos.

merge multiple jpgs to one picture vertikal
# convert tool is from deb imagemagick-6.q16 apt install imagemagick-6.q16

List contents of jar
useful to find the list of dependencies


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