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DNF (abbreviation for Dandified YUM) [7] [8] [9] is a package manager for Red Hat-based Linux distributions and derivatives. DNF was introduced in Fedora 18 in 2013 as a replacement for yum; [10] it has been the default package manager since Fedora 22 in 2015 [11] and Red Hat Enterprise Linux 8 [when?] [12] and is also an alternative package manager for Mageia.
By default, Red Hat Enterprise Linux's up2date retrieves packages from a Red Hat Network (RHN) server, though users can add directories full of packages or even Debian and yum repositories if they wish. up2date on Fedora Core defaults to retrieving packages from yum repositories. Again, other sources can be added (apart from RHN, which is Red ...
YUM aimed to address both the perceived deficiencies in the old APT-RPM, [18] and restrictions of the Red Hat up2date package management tool. YUM superseded up2date in Red Hat Enterprise Linux 5 and later. [19] Some authors refer to YUM as the Yellowdog Update Manager, or suggest that "Your Update Manager" would be more appropriate.
RPM was originally written in 1997 by Erik Troan and Marc Ewing, [1] based on pms, rpp, and pm experiences.. pm was written by Rik Faith and Doug Hoffman in May 1995 for Red Hat Software, its design and implementations were influenced greatly by pms, a package management system by Faith and Kevin Martin in the fall of 1993 for the Bogus Linux Distribution.
Yum extends the functionality of the backend by adding features such as simple configuration for maintaining a network of systems. As another example, the Synaptic Package Manager provides a graphical user interface by using the Advanced Packaging Tool (apt) library, which, in turn, relies on dpkg for core functionality.
rm (short for remove) is a basic command on Unix and Unix-like operating systems used to remove objects such as computer files, directories and symbolic links from file systems and also special files such as device nodes, pipes and sockets, similar to the del command in MS-DOS, OS/2, and Microsoft Windows. The command is also available in the ...
will first remove baz/, then bar/ and finally foo/ thus removing the entire directory tree specified in the command argument. rmdir will not remove a directory if it is not empty in UNIX. The rm command will remove a directory and all its contents recursively. For example:
Red Hat then moved towards splitting its product line into Red Hat Enterprise Linux which was designed to be stable and with long-term support for enterprise users and Fedora as the community distribution and project sponsored by Red Hat. The use of trademarks prevents verbatim copying of Red Hat Enterprise Linux.