Red Hat Package Manager

• Enables a user to build and query software packages
• Allows the system administrator to install, update, erase and build packages
• Checks for required disk space and dependencies when installing a package
• RPM package names are of the format package –version-build.architecture.rpm
  Eg: xfm-1.3.2-13.i386.rpm
• Use rpm –ivh package name to install the packageIf the package is already installed, or if package that depends on are not installed, RPM will show an error message

Linux Today

Linux has been used for many computing platforms
PC, PDA, Supercomputer,…
Current kernel version 2.4.20. 2.5 is coming
Not only character user interface but graphical user interface, thanks to the X-Window technology
Commercial vendors moved in Linux itself to provide freely distributed code. They make their money by compiling up various software and gathering them in a distributable format
Red Hat, Slackware, etc
Chinese distribution of Linux also appeared in Taiwan and China - CLE, Red Flag Linux

A Development of Linux

• UNIX: 1969 Thompson & Ritchie AT&T Bell Labs
• BSD: 1978 Berkeley Software Distribution
• Commercial Vendors: Sun, HP, IBM, SGI, DEC
• GNU: 1984 Richard Stallman, FSF
• POSIX: 1986 IEEE Portable Operating System unIX
• Minix: 1987 Andy Tannenbaum
• SVR4:  1989 AT&T and Sun
• Linux: 1991 Linus Torvalds Intel 386 (i386)
• Open Source: GPL, LGPL, Cathedral and the Bazaar

 GNU project
Established in 1984 by Richard Stallman, who believes that software should be free from restrictions against copying or modification in order to make better and efficient computer programs
GNU is a recursive acronym for “GNU's Not Unix”
Aim at developing a complete Unix-like operating system which is free for copying and modification
Companies make their money by maintaining and distributing the software, e.g. optimally packaging the software with different tools (Redhat, Slackware, Mandrake, SuSE, etc)
Stallman built the first free GNU C Compiler in 1991. But still, an OS was yet to be developed

Features of Modern OS

•Provide a user interface

•Organize files on disk

•Allocating resource to different users with security control

•Co-ordinate programs to work with devices and other programs