Kenneth at 14:40, 21 October 2014

2014-10-21T14:40:05Z

New page

== Erlang ==

"Build massively scalable soft real-time systems" [http://www.erlang.org/]

"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." [http://www.erlang.org/]

== Erlang Niche ==

'"For fault-tolerant, distributed runtimes with memory-isolated process and message-passing concurrency, Erlang pretty much stands alone."'' [http://www.quora.com/Which-is-better-Python-or-Erlang]

== Installation ==

=== Manual Installation ===

Erlang - http://www.erlang.org/
<pre>
yum -y install java java-devel unixODBC-devel
# java-devel will install java-1.6.0-openjdk-devel, which has javac
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
</pre>

=== RedHat/CentOS Installation ===

with 'epel' repo installed:
yum install erlang

=== Debian/Ubuntu Installation ===

apt-get install erlang

== Hello World ==

hello.erl:
<pre>
-module(hello).
-export([hello_world/0]).

% This is a comment

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

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

2> hello:hello_world().
hello, world
ok

3> [Control+C] [or Control+G]
q
</pre>

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

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

== keywords ==

[[Category:Programming]]

Erlang - Revision history

Kenneth at 14:40, 21 October 2014