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The Unix Operating System - Drexel CCI

The Unix Operating SystemSE 101 Spiros MancoridisWhat is an OS?An Operating System (OS) is software that manages the resources of a computerLike most managers, the OS aims to manage its resources in a safe and efficient wayExamples of computer resources are: CPU, RAM, disk memory, printers, displays, keyboard, mouse, etcThe OS also isolates users and application programmers from the underlying computer Operating SystemsMicrosoft WindowsUnixOS ArchitectureWithout an OS, every application would have to implement some part of this software hierarchy ..UnixA popular multi-user, multi-tasking OSAttributes: stability, portability, securityCreated at Bell Labs by Dennis Ritchie and Ken Thompson (won the ACM Turing Award in 1983)Unix is considered one of the greatest achievements in computer scienceHas been around since the 1960s in various forms, , AIX, SCO Unix, SunOS, FreeBSD, OpenBSD, NetBSD.

unix sort command sort filename(s) (sorts line in a group of concatenated files alphabetically) sort-n filename(s) (sorts line in a group of concatenated files ... Insertion Mode Command Mode / : return ESC i l. Moving the cursor You can use your arrow keys Or you can use the h, j, k, l keys h move left one space

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