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Chapter 1. Introduction
To produce the best UNIX(R) like operating system package possible, with due respect to the original software tools ideology as well as usability, performance and stability.
From Scheifler & Gettys: "X Window System"
The Layout of [.filename]#/usr/src#
The complete source code to FreeBSD is available from our public repository. The source code is normally installed in [.filename]#/usr/src# which contains the following subdirectories: El código fuente completo de FreeBSD está disponible en nuestro repositorio público. El código fuente normalmente se instala en<filename>/usr/src</filename>que contiene los siguientes subdirectorios:
| Directory
| Description

|[.filename]#bin/#
|Source for files in [.filename]#/bin#

|[.filename]#cddl/#
|Utilities covered by the Common Development and Distribution License

|[.filename]#contrib/#
|Source for files from contributed software

|[.filename]#crypto/#
|Cryptographical sources

|[.filename]#etc/#
|Source for files in [.filename]#/etc#

|[.filename]#gnu/#
|Utilities covered by the GNU Public License

|[.filename]#include/#
|Source for files in [.filename]#/usr/include#

|[.filename]#kerberos5/#
|Source for Kerberos version 5

|[.filename]#lib/#
|Source for files in [.filename]#/usr/lib#

|[.filename]#libexec/#
|Source for files in [.filename]#/usr/libexec#

|[.filename]#release/#
|Files required to produce a FreeBSD release

|[.filename]#rescue/#
|Build system for the [.filename]#/rescue# utilities

|[.filename]#sbin/#
|Source for files in [.filename]#/sbin#

|[.filename]#secure/#
|Contributed cryptographic sources

|[.filename]#share/#
|Source for files in [.filename]#/usr/share#

|[.filename]#sys/#
|Kernel source files

|[.filename]#tests/#
|The FreeBSD test suite

|[.filename]#tools/#
|Tools used for maintenance and testing of FreeBSD

|[.filename]#usr.bin/#
|Source for files in [.filename]#/usr/bin#

|[.filename]#usr.sbin/#
|Source for files in [.filename]#/usr/sbin#