Pos420 Week2 Dqs

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1. What is the relationship between Linux® and UNIX®? How has their relationship evolved over time? What similarities and differences are seen between them? Linux OS is a derivative of the Unix OS. The Linux OS gain momentum through its progressive licensing which allow others to increase development with the OS. With overwhelming popularity from the creation of Linux OS, Unix OS reintroduce itself again. The functionality of both UNIX and Linux is very similar by both systems able to multitask, both systems are able to run on a variety of hardware platforms, and both are capable to use a command line. Linux is different through user friendly OS and by GUI. 2. How can file permissions be used to establish system security? What effect does this have on the UNIX® or Linux® operating system? File permissions is used by allowing individual users and groups access to files based on a set of security settings for each file and directory. Linux uses a system of user IDs and group IDs to protect access to files, directories, and devices. Linux stores information about user accounts in the /etc/passwd file, and information about groups in the /etc/group file. Each user is assigned a unique numeric user ID, along with a text login name to identify the user in the system. Groups are also assigned unique numerical group IDs, and text group names. A group can contain one or more users to allowed shared access to system resources. Linux uses a complicated system of bits to determine access permissions for files and directories. Each file contains three security levels of protection: the file’s owner, a default group that has access to the file, and a level for everyone else on the system. Each security level is defined by three access bits: read, write, and execute. The combination of three bits is often referred to by the symbols rwx, for read, write, and execute.

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