Erlang

Erlang
"Build massively scalable soft real-time systems"

"Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance." 

Erlang Niche
'"For fault-tolerant, distributed runtimes with memory-isolated process and message-passing concurrency, Erlang pretty much stands alone."''

Manual Installation
Erlang - http://www.erlang.org/ yum -y install java java-devel unixODBC-devel mkdir -p ~/.src ; cd ~/.src wget http://www.erlang.org/download/otp_src_R15B.tar.gz tar -zvxf otp_src_R15B.tar.gz cd otp_src_R15B ./configure --prefix=/opt/erlang make clean && make && sudo make install
 * 1) java-devel will install java-1.6.0-openjdk-devel, which has javac

RedHat/CentOS Installation
with 'epel' repo installed: yum install erlang

Debian/Ubuntu Installation
apt-get install erlang

Hello World
hello.erl: -module(hello). -export([hello_world/0]).

% This is a comment

hello_world -> io:fwrite("hello,"), io:fwrite(" world\n").

compile and run from erl shell: $ erl 1> c(hello). {ok,hello}

2> hello:hello_world. hello, world ok

3> [Control+C] [or Control+G] q

compile and run from command line: $ erl -compile hello $ erl -noshell -s hello hello_world -s init stop hello, world

References:
 * Erlang -- Getting Started - http://www.erlang.org/faq/getting_started.html

Examples
Erlang - Programming Examples User's Guide - http://www.erlang.org/doc/programming_examples/users_guide.html