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PC-BSD, up to and including version 8.2, a predecessor of TrueOS (an operating system based on FreeBSD) places packages and dependencies into self-contained directories in /Programs, which avoids breakage if system libraries are upgraded or changed. It uses its own "PBI" (Push Button Installer) for package management. [8]
Because software, unlike a major civil engineering construction project, is often easy and cheap to change after it has been constructed, a piece of custom software that fails to deliver on its objectives may sometimes be modified over time in such a way that it later succeeds—and/or business processes or end-user mindsets may change to accommodate the software.
Package metadata include package description, package version, and dependencies (other packages that need to be installed beforehand). Package managers are charged with the task of finding, installing, maintaining or uninstalling software packages upon the user's command. Typical functions of a package management system include:
When an MSI-based program is launched, Windows Installer checks the existence of key paths. If there is a mismatch between the current system state and the value specified in the MSI package (e.g., a key file is missing), the related feature is re-installed. This process is known as self-healing or self-repair. No two components should use the ...
In the early 1970s, companies began to separate out software maintenance with its own team of engineers to free up software development teams from support tasks. [1] In 1972, R. G. Canning published "The Maintenance 'Iceberg '", in which he contended that software maintenance was an extension of software development with an additional input: the existing system. [1]
Name Developer Status License Can build Windows Installer packages? Can build MSIX packages? Can Capture ? IExpress: Microsoft (Part of Windows) : Active Freeware (proprietary) ...
Failures which occur that can be left or maintained in an unrepaired condition, and do not place the system out of service, are not considered failures under this definition. [2] In addition, units that are taken down for routine scheduled maintenance or inventory control are not considered within the definition of failure. [3]
A truth maintenance system, or TMS, is a knowledge representation method for representing both beliefs and their dependencies and an algorithm called the "truth maintenance algorithm" that manipulates and maintains the dependencies. The name truth maintenance is due to the ability of these systems to restore consistency.