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The LINUX Operating System. By Cathy Thiaw ID # 89261 COSC 513 Lecturer: M. Anvari SEU ‘99 Summer Term. Plan. What’s Linux? Linux Features Resource Management Processes Security Comparison with other OS. What’s Linux?.

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The linux operating system
The LINUX Operating System

  • By Cathy Thiaw

  • ID # 89261

  • COSC 513 Lecturer: M. Anvari

  • SEU ‘99 Summer Term


Plan

  • What’s Linux?

  • Linux Features

  • Resource Management

  • Processes

  • Security

  • Comparison with other OS


What s linux
What’s Linux?

  • an OS initially created by Linus Torvalds (Finland) and a team working over the Internet;

  • developed from MINIX, a small Unix system;

  • An open and free operating system, adaptable to meet individuals needs;


Linux features
Linux Features

  • Multitasking

  • Virtual memory

  • Shared libraries

  • Multi_users capabilities

  • X-windows systems

  • Run most Unix programs


Linux features1
Linux Features

  • Advanced networking capabilities: LAN or WAN setting, different types of protocols, fast TCP/IP drivers

  • Support for Macintosh, Windows, NT, Novell, OS/2

  • Server or Client


Resource management
Resource Management

  • Use of semaphores

  • 1 process at a time can access to some resource

  • The semaphore data structure includes a count of number of processes that wish to use a resource, a waking parameter (number of processes waiting to be woken up), and a wait queue.


Processes on linux
Processes on Linux

  • Interprocess-communications: Unix -liked mechanisms of signals, pipes and semaphores, shared memory...

  • Relationships parent / child process

  • Most process has virtual memory


Processes on linux1
Processes on Linux

  • Max number of processes in the system: 512

  • State process:

    • *running

    • *waiting: interruptible or uninterruptible

    • -*stopped

    • *zombie: dead process


Security
Security

  • Security on Linux is comparable with most Unix system

  • Security tools : firewalls, packets filtering, encryption, kerberos… are available

  • Monitoring (logs) and audit of logon activities, resource utilization …available


Comparison with other os
Comparison with other OS

  • Windows NT

  • BSDI

  • Solaris 7.0


Network inter operability

Runnable foreign libraries:

-Linux2.2: Windows 3.*‑98 Mac (Executor), SCO and some other Intel based SysV's(iBCS)

NT4: MAC(Executor),dos, windows 3.1/W32

BSDI: DOS, support for Linux in development

Solaris: Macintosh,Windows 3.1

Network Inter-operability


Network and inter operability
Network and Inter-operability

  • Mountable filesystems

  • Linux 2.2: FAT, FS read-only,HPFS read-only (OS/2), iso9660 (CDROM), minix, NTFS (read-only), HFS (MacOS)…

  • NT4: FAT, NTFS, iso9660

  • BSDI: iso9660

  • Solaris: UFS, FAT (dos, windows),UFS, iso9660…


Os convenience
OS Convenience

  • Bug fix and other updates:

  • Linux2.2.: Freely download able

  • NT4: not free

  • BSDI: Some minor, updates/bugfixes can be downloaded freely.

  • Solaris7.0: not free


References
References

  • http://www.zinezone.com/zines/digital/software/linux/index.html

  • http://metalab.unc.edu/mdw/LDP/tlk/tlk.html

  • http://www.aie.nl/software_doc/tlk‑html/node45.html

  • http://www.ecst.csuchico.edu/~jtmurphy/Keep_safe_info.html

  • http://www.linuxhq.com/HOWTO/Security‑HOWTO‑9.html


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