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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
R
realpath
Display the canonical absolute pathname (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
  - 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
  - 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
    - D
    - E
    - F
    - G
    - H
    - I
    - J
    - K
    - L
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    - R
      - random
        Generator of secure random data
      - ranlib
        Index an archive
      - readelf
        Display information about an ELF binary
      - readlink
        Print what symlink points to or produce canonical filepaths (POSIX, toybox)
      - realpath
        Display the canonical absolute pathname (POSIX, toybox)
      - renice
        Adjust the priorities of running processes (POSIX)
      - /etc/resolv.conf
        Resolver configuration file
      - resource_seed
        Create and seed the system resource database
      - rm (host)
        Remove files (POSIX)
      - rm (target)
        Remove each argument from the filesystem (POSIX, toybox)
      - rmdir (host)
        Remove directories (POSIX)
      - rmdir (target)
        Remove one or more directories (POSIX, toybox)
      - route
        Manually manipulate the routing tables
      - /etc/rpc
        RPC program number database
      - rpcbind, portmap
        Map RPC program numbers into universal addresses
      - rpcinfo
        Report RPC information
      - rsrcdb_query
        Display database entries for PCI-related resources
      - rtadvd
        Router advertisement daemon
      - /etc/rtadvd.conf
        Configuration file for router advertisement daemon
      - rtc
        Set or get date and time from realtime clock (QNX OS)
      - rust (host)
        Statically-typed general-purpose programming language.
    - 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 OS in the Amazon cloud environment.
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 User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
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.

realpath

Display the canonical absolute pathname (POSIX, toybox)

Syntax:

realpath [-eLmPqsz] [--relative-base dir] [-R dir] file...

Runs on:

QNX OS

Options:

-e: Display the canonical path to existing entry (fails if missing).
-L: Display logical path (resolve .. components before symlinks).
-m: Ignore missing entries, show where it would be.
-P: Display physical path (default).
-q: Be quiet (no error messages).
-R dir: Show ../path relative to dir directory (--relative-to).
---relative-base dir: Trim off the prefix if the path is under the dir directory.
-s: Don't expand symlinks.
-z: Use NUL character instead of a newline character.
file: The pathname of a file to use as input.

Description:

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: August 11, 2025