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The computer tool patch is a Unix program that updates text files according to instructions contained in a separate file, called a patch file.The patch file (also called a patch for short) is a text file that consists of a list of differences and is produced by running the related diff program with the original and updated file as arguments.
Patches for proprietary software are typically distributed as executable files instead of source code. When executed these files load a program into memory which manages the installation of the patch code into the target program(s) on disk. Patches for other software are typically distributed as data files containing the patch code.
Patch management is concerned with the identification, acquisition, distribution, and installation of patches to systems. Proper patch management can be a net productivity boost for the organization. Patches can be used to defend against and eliminate potential vulnerabilities of a system, so that no threats may exploit them. Problems can arise ...
The difference is an exact number of quarters of an hour up to 95 (same minutes modulo 15 and seconds) if the file was transported across zones; there is also a one-hour difference within a single zone caused by the transition between standard time and daylight saving time (DST). Some, but not all, file comparison and synchronisation software ...
For distributions based on .deb and .rpm files as well as Slackware Linux, there is CheckInstall, and for recipe-based systems such as Gentoo Linux and hybrid systems such as Arch Linux, it is possible to write a recipe first, which then ensures that the package fits into the local package database.
A file archive (the payload), which usually is in cpio format, compressed with gzip. The rpm2cpio tool enables retrieval of the cpio file without needing to install the RPM package. [18] The Linux Standard Base requires the use of gzip, but Fedora 30 packages are xz-compressed and Fedora 31 packages might be zstd-compressed. [19]
For example, quilt is heavily used by the maintainers of the Linux kernel. [ 2 ] Quilt evolved from a set of patch-management scripts originally written by Linux kernel developer Andrew Morton , [ 3 ] and was developed by Andreas Grünbacher for maintaining Linux kernel customizations for SuSE Linux . [ 4 ]
kpatch is a feature of the Linux kernel that implements live patching of a running kernel, which allows kernel patches to be applied while the kernel is still running. By avoiding the need for rebooting the system with a new kernel that contains the desired patches, kpatch aims to maximize the system uptime and availability.