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<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<TITLE>1.4.3 Programming languages and utilities</TITLE>
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<H2><A NAME=SECTION00343000000000000000>1.4.3 Programming languages and utilities</A></H2>
<P>
Linux provides a complete UNIX programming environment, including all of
the standard libraries, programming tools, compilers, and debuggers that
you would expect to find on other UNIX systems.
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Within the UNIX software development world, applications and systems
programming is usually done in C or C++. The standard C and C++ compiler
for Linux is GNU's <tt>gcc</tt>, which is an advanced, modern compiler
supporting many options.
It is also capable of compiling C++ (including AT&amp;T 3.0 features) as well as
Objective-C, another object-oriented dialect of C.
<P>
Besides C and C++, many other compiled and interpreted programming
languages have been ported to Linux, such as Smalltalk, FORTRAN, Pascal,
LISP, Scheme, and Ada (if you're masochistic enough to program in Ada---we're
not going to stop you). In addition, various assemblers for writing
protected-mode 80386 code are available, as are UNIX hacking favorites
such as Perl (the script language to end all script languages) and
Tcl/Tk (a shell-like command processing system including support for
developing simple X Windows applications).
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The advanced <tt>gdb</tt> debugger has been ported, which allows you to
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step through a program to find bugs, or examine the cause for a crash using
a core dump. <tt>gprof</tt>, a profiling utility, will give you performance
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statistics for your program, letting you know where your program is spending
most of its time executing. The Emacs text editor provides an interactive
editing and compilation environment for various programming languages.
Other tools include GNU <tt>make</tt> and <tt>imake</tt>, used to manage
compilation of large applications; and RCS, a system for source locking and
revision control.
<P>
Linux implements dynamically-linked shared libraries, which allow binaries
to be much smaller as the subroutine code is linked at run-time. These
DLL libraries also allow the applications programmer to override
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function definitions with their own code. For example, if a programmer
wished to write her own version of the <tt>malloc()</tt> library routine,
the linker would use the programmer's new routine instead of the
one found in the libraries.
<P>
Linux is ideal for developing UNIX applications. It provides a modern
<A NAME=321>&#160;</A>
programming environment with all of the bells and whistles. Various
standards such as POSIX.1 are supported, allowing software written for
Linux to be easily ported to other systems. Professional UNIX programmers and
system administrators can use Linux to develop software at home, and then
transfer the software to UNIX systems at work. This not only can save a great
deal of time and money, but will also let you work in the comfort of your own
home.<A NAME=tex2html68 HREF="footnode.html#322"><IMG ALIGN=BOTTOM ALT="gif" SRC="foot_motif.gif"></A> Computer Science students can use Linux
to learn UNIX programming and to explore other aspects of the system,
such as kernel architecture.
<P>
With Linux, not only do you have access to the complete set of libraries and
programming utilities, but you also have the complete kernel and library
source code at your fingertips.
<P>
<A NAME=323>&#160;</A>
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<P><ADDRESS>
<I>Matt Welsh <BR>
mdw@sunsite.unc.edu</I>
</ADDRESS>
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