addstr, addnstr, waddstr, waddnstr, mvaddstr, mvaddnstr, mvwaddstr,
   mvwaddnstr - add a string of characters to a curses window and advance


   #include <curses.h>

   int addstr(const char *str);
   int addnstr(const char *str, int n);
   int waddstr(WINDOW *win, const char *str);
   int waddnstr(WINDOW *win, const char *str, int n);
   int mvaddstr(int y, int x, const char *str);
   int mvaddnstr(int y, int x, const char *str, int n);
   int mvwaddstr(WINDOW *win, int y, int x, const char *str);
   int mvwaddnstr(WINDOW *win, int y, int x, const char *str, int n);


   These functions write the (null-terminated) character string str on the
   given window.  It is similar to calling waddch once for each  character
   in the string.

   The  mv  functions  perform  cursor  movement  once, before writing any
   characters.  Thereafter, the cursor is advanced  as  a  side-effect  of
   writing to the window.

   The  four  functions  with  n  as  the  last  argument  write at most n
   characters, or until a terminating null is reached.  If n is  -1,  then
   the entire string will be added.


   All functions return the integer ERR upon failure and OK on success.

   X/Open  does  not  define  any  error  conditions.  This implementation
   returns an error

   *   if the window pointer is null or

   *   if the string pointer is null or

   *   if the corresponding calls to waddch return an error.

   Functions with a "mv" prefix first  perform  a  cursor  movement  using
   wmove, and return an error if the position is outside the window, or if
   the window pointer is null.


   All of these functions except waddnstr may be macros.


   These functions are described in the XSI Curses standard, Issue 4.


   ncurses(3NCURSES), addch(3NCURSES).



Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.