7 command-line tools for data science

http://jeroenjanssens.com/2013/09/19/seven-command-line-tools-for-data-science.html

Shell command to sum integers, one per line? - Stack Overflow

http://stackoverflow.com/questions/450799/shell-command-to-sum-integers-one-per-line

# Order lines of a file by the length of the line descending.

awk '{print length($0),$0}' names.txt | sort -nr | cut -d' ' -f2-

Alternatives to a 3D Bar Chart - Peltier Tech Blog

http://peltiertech.com/WordPress/3d-bar-chart-alternatives/

Working with Structured Data Using Command Line Tools in Linux | William J Turkel

http://williamjturkel.net/2013/09/03/working-with-structured-data-using-command-line-tools-in-linux/

Linux Command Line Cheat Sheet by DaveChild - Cheatography.com

http://www.cheatography.com/davechild/cheat-sheets/linux-command-line/