Download The LINUX Operating System

The LINUX Operating System
• By Cathy Thiaw
• ID # 89261
• COSC 513
• SEU
Lecturer: M. Anvari
‘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;
• An open and free operating system,
adaptable to meet individuals needs;
Linux Features
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Multitasking
Virtual memory
Shared libraries
Multi_users capabilities
X-windows systems
Run most Unix programs
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
• 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
• Interprocess-communications: Unix -liked
mechanisms of signals, pipes and
semaphores, shared memory...
• Relationships parent / child process
• Most process has virtual memory
Processes on Linux
• Max number of processes in the system:
512
• State process:
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*running
*waiting: interruptible or uninterruptible
-*stopped
*zombie: dead process
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
• 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 and Inter-operability
• Mountable filesystems
• Linux 2.2: FAT, FS readonly,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
• 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