The%20LINUX%20Operating%20System

1
The LINUX Operating System

• By Cathy Thiaw
• ID 89261
• COSC 513 Lecturer M. Anvari
• SEU 99 Summer Term

2
Plan

• Whats Linux?
• Linux Features
• Resource Management
• Processes
• Security
• Comparison with other OS

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Whats 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

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Linux Features

• Multitasking
• Virtual memory
• Shared libraries
• Multi_users capabilities
• X-windows systems
• Run most Unix programs

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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

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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.

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Processes on Linux

• Interprocess-communications Unix -liked
  mechanisms of signals, pipes and semaphores,
  shared memory...
• Relationships parent / child process
• Most process has virtual memory

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Processes on Linux

• Max number of processes in the system 512
• State process
• running
• waiting interruptible or uninterruptible
• -stopped
• zombie dead process

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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

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Comparison with other OS

• Windows NT
• BSDI
• Solaris 7.0

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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

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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

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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

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References

• http//www.zinezone.com/zines/digital/software/lin
  ux/index.html
• http//metalab.unc.edu/mdw/LDP/tlk/tlk.html
• http//www.aie.nl/software_doc/tlk-html/node45.htm
  l
• http//www.ecst.csuchico.edu/jtmurphy/Keep_safe_i
  nfo.html
• http//www.linuxhq.com/HOWTO/Security-HOWTO-9.html