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Learning some useful command-line 
tricks
Productivity hacks utilizing the shell are some of my favorite things in this world, 
right up there with music, video games, and Diet Pepsi. There's nothing like the 
feeling you get when you discover a useful feature that saves you time or increases 
your efficiency. There are many things I've discovered along the way that I wish I 
had known earlier on. One of my goals while writing this book is to teach you as 
many things as I can that took me longer to learn than I'm comfortable admitting 
to. In this section, in no particular order, I'll go over a few tricks that increased my 
workflow.
Having commands prefixed with a space ignored in Bash is 
actually a custom option enabled by default in Ubuntu Server. Not 
all distributions include this feature. If you're using a distribution 
that doesn't have this feature, add the following to your 
.bashrc
 
file (we will talk about this file in greater detail later).
HISTCONTROL=ignoreboth
This configuration line also causes duplicate commands to not be 
entered into the history file as well, which can condense the history 
file.

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Boosting Your Command-line Efficiency