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Latest commit 53b483c Mar 29, 2017 @psyeugenic psyeugenic Merge branch 'egil/erts/fix-copy-sharing-assert'
* egil/erts/fix-copy-sharing-assert:
  erts: Fix faulty assert for refs in copy sharing
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HOWTO Merge branch 'maint' Nov 2, 2016
bin The R13B03 release. Nov 20, 2009
bootstrap Update primary bootstrap Mar 24, 2017
erts Merge branch 'egil/erts/fix-copy-sharing-assert' Mar 29, 2017
lib Merge PR-1392 from margnus1/hipe-range-fixpoint-bug OTP-14306 Mar 28, 2017
make Merge branch 'binarin/even-more-absolute-paths/PR-1103/OTP-13800' int… Aug 12, 2016
plt The R13B03 release. Nov 20, 2009
scripts Run the smoke test for both SMP and non-SMP emulator Mar 8, 2017
system Update the documentation regarding Unicode atoms Mar 17, 2017
xcomp ose: Remove all code related to the OSE port Jul 10, 2015
.dir-locals.el Do not force space/tab indent-tabs-mode for all file types Jan 11, 2017
.gitattributes Stop including in .gitignore files in the source tar files Aug 18, 2010
.gitignore Ignore generated dirs of one more configutation Nov 1, 2016
.mailmap Add .mailmap file Feb 14, 2010
.travis.yml Smoke test HiPE in the 32-bit build Mar 24, 2017
AUTHORS The R13B03 release. Nov 20, 2009 Create (#1278) Dec 15, 2016
LICENSE.txt Change license text to APLv2 Jun 18, 2015 Remove typer application Mar 8, 2017
OTP_VERSION Merge branch 'maint' Oct 11, 2016 Update Mar 21, 2017
TAR.include Move README and INSTALL to HOWTO folder Jul 19, 2012 Merge branch 'maint' Oct 19, 2016 Change license text to APLv2 Jun 18, 2015
otp_build Clean configure when before invoking autoconf Mar 13, 2017
otp_patch_apply Change license text to APLv2 Jun 18, 2015
otp_versions.table Updated OTP version Mar 14, 2017
prebuild.delete Regenerate bootstrap/{erl,erlc} when switching target Aug 9, 2010
prebuild.skip OTP-8323 Cross compilation improvements and other build system Feb 3, 2010


Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability.

OTP is a set of Erlang libraries, which consists of the Erlang runtime system, a number of ready-to-use components mainly written in Erlang, and a set of design principles for Erlang programs. Learn more about Erlang and OTP.

Learn how to program in Erlang.


There are several examples on the website to help you get started. The below example defines a function world/0 that prints "Hello, world" in the Erlang shell:


world() -> io:format("Hello, world\n").

Save the file as hello.erl and run erl to enter the Erlang shell to compile the module.

Erlang/OTP 19 [erts-8.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Eshell V8.2  (abort with ^G)
1> c(hello).
2> hello:world().
Hello, world

Learn more about the Erlang syntax of modules, functions and expressions on


Binary Distributions

Erlang/OTP is available as pre-built binary packages by most OS package managers.

apt-get install erlang

Compiling from source

To compile Erlang from source, run the following commands. The complete building and installation instructions can be found here.

git clone
cd otp
./otp_build autoconf
make install

Alternatively, you can use Kerl, a script that lets you easily build Erlang with a few commands.

Bug Reports

Please visit for reporting bugs. The instructions for submitting bugs reports can be found here.

Security Disclosure

We take security bugs in Erlang/OTP seriously. Please disclose the issues regarding security by sending an email to erlang-security [at] erlang [dot] org and not by creating a public issue.


We are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving Erlang/OTP. We appreciate your help!

Contribution Guide

Read our contribution guide to learn about our development process, how to propose fixes and improvements, and how to test your changes to Erlang/OTP before submitting a pull request.

Help Wanted

We have a list of Help Wanted bugs that we would appreciate external help from the community. This is a great place to get involved.


Erlang/OTP is released under the Apache License 2.0.


Copyright Ericsson AB 2010-2017. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.



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