In this chapter, we will discuss in detail about file management in Unix. All data in Unix is organized into files. All files are organized into directories. These directories are organized into a tree-like structure called the filesystem.
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Unix / Linux - File Management
Linux write command help and examples
Most file systems have methods to assign permissions or access rights to specific users and groups of users. These permissions control the ability of the users to view, change, navigate, and execute the contents of the file system. In some cases, menu options or functions may be made visible or hidden depending on a user's permission level; this kind of user interface is referred to as permission-driven. Two types of permissions are very widely used: traditional Unix permissions date back many decades to the earliest days of Unix. They are universally available on all Unix and Linux derived platforms. Access Control Lists ACLs are more recent in origin and are universally used on Microsoft Windows -based file systems where the file system supports user permissions mainly NTFS and ReFS and are also now commonly used and widely available in most common Unix- and Linux-based systems, although not necessarily all. They are generally capable of far more detailed fine tuning of permissions than the traditional Unix permissions and permit a system of access control which traditional ACLs cannot provide.
How Unix Works: Become a Better Software Engineer
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The Unix philosophy , originated by Ken Thompson , is a set of cultural norms and philosophical approaches to minimalist , modular software development. It is based on the experience of leading developers of the Unix operating system. Early Unix developers were important in bringing the concepts of modularity and reusability into software engineering practice, spawning a " software tools " movement. Over time, the leading developers of Unix and programs that ran on it established a set of cultural norms for developing software; these norms became as important and influential as the technology of Unix itself; this has been termed the "Unix philosophy.