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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 QNX Neutrino 7.1.
Utilities & Libraries
Utilities Reference
M
melt
Uncompress frozen files (UNIX)

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics 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 QNX Neutrino 7.1.
- Quickstart Guide
- OS Components & Operations
- Audio & Graphics API
- Multimedia
- Networking Middleware
- Programming
- Sensor Framework
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino resource manager free from vulnerabilities.
- Utilities & Libraries
  - Addon Interfaces Library Reference
  - C Library Reference
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - Utilities Reference
    - Utility Conventions
    - A
    - B
    - C
    - D
    - E
    - F
    - G
    - H
    - I
    - J
    - K
    - L
    - M
      - m4
        Macro processor (GNU)
      - /usr/share/misc/magic
        Magic-number file for the file command (UNIX)
      - make
        Maintain, update, and regenerate groups of programs (POSIX)
      - mdnsd
        Multicast and Unicast DNS daemon
      - melt
        Uncompress frozen files (UNIX)
      - mesg
        Enable, disable, or query broadcast messages (QNX Neutrino)
      - mix_ctl
        Control the groups and switches in an audio mixer
      - mkasmoff
        Create an assembler include file from an ELF or COFF file
      - mkbuild
        Build one or more IDE projects
      - mkcldr
        Convert CLDR text file to binary data for libqdb_cldr.so
      - mkdir
        Make directories (POSIX)
      - mkdosfs
        Format a DOS (FAT-12/16/32) filesystem (QNX Neutrino)
      - mkefs
        Build an embedded filesystem (QNX)
      - mketfs
        Build an embedded transaction filesystem (QNX)
      - mkfatfsimg
        Build a FAT filesystem image (QNX)
      - mkfifo
        Make FIFO special files (POSIX)
      - mki
        Prepend a U-Boot image header to an image
      - mkifs
        Build an OS image filesystem (QNX)
      - mkimage
        Build a socket image from individual files (QNX)
      - mkqfs
        Build QNX-supported filesystems
      - mkqnx6fs
        Format a Power-Safe filesystem (QNX Neutrino)
      - mkqnx6fsimg
        Build a Power-Safe filesystem image (QNX)
      - mkqnximage
        Generate a QNX Neutrino virtual machine image
      - mkrec
        Convert a binary image into ROM format (QNX)
      - mkshadow
        Create entries for QNX Neutrino shadow files
      - mktemp
        Create a unique temporary file or directory
      - mkxfs
        Make a filesystem image (QNX)
      - /etc/ssh/moduli
        System moduli file for sshd
      - more
        Display files on a page-by-page basis (POSIX)
      - mount
        Mount a block special device or remote filesystem
      - mount_ifs
        Mount an image filesystem (QNX)
      - mq
        Alternate message queue manager (QNX Neutrino)
      - mqueue
        Traditional message queue manager (QNX Neutrino)
      - mrouted
        IP multicast routing daemon
      - mv
        Move files (POSIX)
    - N
    - O
    - P
    - 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.
QNX Hypervisor
The QNX Hypervisor allows 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.
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 Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

melt

Uncompress frozen files (UNIX)

Syntax:

melt [-cfvVz] [filename...]

Runs on:

QNX Neutrino

Options:

See freeze.

Description:

The melt utility is equivalent to freeze -d. See the freeze utility for details.

Note:

The freeze, melt, and fcat compression utilities will eventually become deprecated in favor of toybox utilities, which include, gzip, gunzip, and zcat. The freeze suite of utilities will continue to be provided for quite some time before being eliminated completely.

Contributing author:

Leonid A. Broukhis

Page updated: March 12, 2026