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# Ruby Hacking Guide
This document gives some helpful instructions which should make your experience as a Ruby core developer easier.
## Setup
### Make
It's common to want to compile things as quickly as possible. Ensuring `make` has the right `--jobs` flag will ensure all processors are utilized when building software projects. To do this effectively, you can set `MAKEFLAGS` in your shell configuration/profile:
``` shell
# On macOS with Fish shell:
export MAKEFLAGS="--jobs "(sysctl -n hw.ncpu)
# On macOS with Bash/ZSH shell:
export MAKEFLAGS="--jobs $(sysctl -n hw.ncpu)"
# On Linux with Fish shell:
export MAKEFLAGS="--jobs "(nproc)
# On Linux with Bash/ZSH shell:
export MAKEFLAGS="--jobs $(nproc)"
```
## Configure Ruby
It's generally advisable to use a build directory.
``` shell
./autogen.sh
mkdir build
cd build
../configure --prefix $HOME/.rubies/ruby-head
make install
```
### Without Documentation
If you are frequently building Ruby, this will reduce the time it takes to `make install`.
``` shell
../configure --disable-install-doc
```
## Running Ruby
### Run Local Test Script
You can create a file in the Ruby source root called `test.rb`. You can build `miniruby` and execute this script:
``` shell
make run
```
If you want more of the standard library, you can use `runruby` instead of `run`.
### Run Bootstrap Tests
There are a set of tests in `bootstraptest/` which cover most basic features of the core Ruby language.
``` shell
make test
```
### Run Extensive Tests
There are extensive tests in `test/` which cover a wide range of features of the Ruby core language.
``` shell
make test-all
```
You can run specific tests by specifying their path:
``` shell
make test-all TESTS=../test/fiber/test_io.rb
```
### Run RubySpec Tests
RubySpec is a project to write a complete, executable specification for the Ruby programming language.
``` shell
make test-all test-rubyspec
```
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