Bash is the GNU Project's shell. Bash is the Bourne Again SHell. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use. In addition, most sh scripts can be run by Bash without modification.
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The basic directory layout for a Linux system
The filesystem package is one of the basic packages that is installed on a Linux system. Filesystem contains the basic directory layout for a Linux operating system, including the correct permissions for the directories.
Efi-filesystem is the structure and logic rules used to manage the groups of information of EIF machines, it contains the basic directory layout for EFI machine bootloaders and tools.