(changes made) Update free-programming-books-langs.md (#9591)

* Update free-programming-books-langs.md

Added Adventures with the Linux Command Line by William E. Shotts. Jr.

* (changes made) Update books/free-programming-books-langs.md

Co-authored-by: Eric Hellman <eric@hellman.net>

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -1457,6 +1457,7 @@ Books on general-purpose programming that don't focus on a specific language are
 
 * [Ad Hoc Data Analysis From The Unix Command Line](https://en.wikibooks.org/wiki/Ad_Hoc_Data_Analysis_From_The_Unix_Command_Line) - Wikibooks
 * [Advanced Linux Programming](https://mentorembedded.github.io/advancedlinuxprogramming/) (PDF)
+* [Adventures with the Linux Command Line](http://linuxcommand.org/lc3_adventures.php) - William E. Shotts Jr.
 * [Automated Linux From Scratch](http://www.linuxfromscratch.org/alfs/download.html)
 * [Getting Started with Ubuntu](http://ubuntu-manual.org)
 * [GNU Autoconf, Automake and Libtool](http://www.sourceware.org/autobook/download.html)