added [UNIX Commands and Concepts] to [Unix]

cc8f3b88 · kingdido999 · 9e152b4c · cc8f3b88
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free-programming-books.md free-programming-books.md +1 -0

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@@ -1766,6 +1766,7 @@ See also [LaTeX](#latex)
 * [Unix Toolbox](http://cb.vu/unixtoolbox.xhtml) - Colin Barschel
 * [UNIX Tutorial for Beginners](http://www.ee.surrey.ac.uk/Teaching/Unix/)
 * [Unix for Poets](http://www.stanford.edu/class/cs124/kwc-unix-for-poets.pdf) - Kenneth Ward Church (PDF)
+* [UNIX Commands and Concepts](http://www.cs.bu.edu/teaching/unix/reference/) - Robert I. Pitts


 ### Verilog