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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
Utilities & Libraries
Utilities Reference
C
chown
Change the ownership of files and directories (POSIX, toybox)

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
  - C Library Reference
  - Devctl and Ioctl Commands
  - Introspection API Reference
  - JSON Library Reference
  - PAM Reference
  - QNX Helpers Developer's Guide
    These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
  - SPI Framework Technote
  - GPIO Framework
  - QNX Cryptography Library
    The QNX Cryptography Library (qcrypto) is a flexible cryptography framework that allows you to choose which cryptography provider responds to requests on a per-process basis.
  - QNX devcrypto Service
  - Utilities Reference
    - Utility Conventions
    - A
    - B
    - C
      - c++filt
        Demangle C++ and Java symbols
      - cal
        Print a calendar (POSIX, toybox)
      - cam-cdrom.so
        Provide a common access method for CD-ROMs
      - cam-disk.so
        Provide a common access method for hard disks
      - cam-optical.so
        Provide a common access method for optical disks
      - canctl
        Control a CAN (Controller Area Network) device
      - cat
        Concatenate and print files (POSIX, toybox)
      - chattr
        Manipulate the attributes of a file (QNX OS)
      - chemod
        Change file extended mode bits (non-POSIX)
      - chgrp
        Change file group ownership (POSIX, toybox)
      - chkdosfs
        Check a DOS (FAT-12/16/32) filesystem for consistency (QNX OS)
      - chkqnx6fs
        Check an entire Power-Safe filesystem for consistency (QNX OS)
      - chmod
        Change file modes (POSIX, toybox)
      - chown
        Change the ownership of files and directories (POSIX, toybox)
      - cksum (host)
        Display file checksums and block counts (POSIX)
      - cksum (target)
        Display file checksums and block counts (POSIX, toybox)
      - clear
        Clear the screen (POSIX, toybox)
      - cmp
        Compare two files (POSIX, toybox)
      - cndfs
        Condense, restore, or mirror filesystems or disks
      - comm
        Select or reject lines common to two files (POSIX, toybox)
      - confstr
        Get or set a configuration string
      - coreinfo
        Display information about a core file
      - cp
        Copy files (POSIX, toybox)
      - cpio (host)
        Copy file archives in and out (UNIX)
      - cpio (target)
        Copy file archives into and out of a newc format cpio archive (POSIX, toybox)
      - crc32
        Output CRC-32 checksum for each file (POSIX, toybox)
      - cron
        Clock server (UNIX)
      - crontab
        Schedule periodic background work (POSIX)
      - cut
        Print selected fields of each line of a file to standard output (POSIX, toybox)
    - D
    - E
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    - I
    - J
    - K
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    - O
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    - Q
    - R
    - S
    - T
    - U
    - V
    - W
    - X
    - Y
    - Z
    - Commonly Used Environment Variables
    - Selecting the Target System
    - Glossary
  - WPA Control Interface Reference
    This document provides a reference for the Wi-Fi Protected Access (WPA) control interface, which provides a C API for the WPA/IEEE 802.11i protocols in Wi-Fi client stations. Application developers who want to control WPA operations and get associated status and event data should read this reference.
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor and QNX Hypervisor for Safety
The QNX Hypervisor and QNX Hypervisor for Safety products allow you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

chown

QNX SDP8.0Utilities ReferenceUtilities

Change the ownership of files and directories (POSIX, toybox)

Syntax:

chown [-HLPR] [-fhv] user ownership file...

Runs on:

QNX OS

Options:

For a complete listing, see chgrp.

Description:

The chown utility changes the user ownership of one or more files.

This utility is provided as part of the toybox package. For information on how to enable it, see toybox.

Contributing author:

Rob Landley and the toybox project (see https://landley.net/toybox/).

Page updated: June 11, 2026