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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. 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;

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The LINUX Operating System

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  1. The LINUX Operating System • By Cathy Thiaw • ID # 89261 • COSC 513 Lecturer: M. Anvari • SEU ‘99 Summer Term

  2. 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;

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

  4. 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

  5. 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.

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

  7. Processes on Linux • Max number of processes in the system: 512 • State process: • *running • *waiting: interruptible or uninterruptible • -*stopped • *zombie: dead process

  8. 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

  9. Comparison with other OS • Windows NT • BSDI • Solaris 7.0

  10. 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

  11. 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…

  12. 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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