Unix Training - 1

UNIX
Ankit Mehta
ankitmehta21@gmail.com

UNIX TRAINING - ANKIT MEHTA |
ANKITMEHTA21@GMAIL.COM

PREFACE
• This training will be divided in 5 major sections. I will publish video tutorial for this training
on different video platforms. I would suggest to go through one chapter each day, it will
help you to complete this training in one month.
• You can send me your suggestions to ankitmehta21@gmail.com


SECTIONS
• Part 1 : Unix Basics
• In this sections you will learn about basic commands and different flavors of UNIX.
• Part 2: Networking
• This section consists of networking commands and network configurations on UNIX
platforms
• Part 3: System Administrations
• This section will give you details about the commands to administrate the system
• Part 4: Network Administration
• This section will help you to administrate the network
• Part 5: Tools and Programming
• Basic tools and programming in UNIX


PART 1
• Background of UNIX
• It is important to understand the background of UNIX operating system. Once we
understand the type, structure and different version of UNIX operating system it will
help you to work well on it.


WHAT IS UNIX?
• UNIX is an operating system, It’s more than 40 years but still it is being used by many
companies.
• Now a days there are many flavors (types of Unix) available which basically differs in their
kernel inner codes and features.

• Terms:
• Operating System: As per the definition from wikipedia
“An operating system (OS) is a collection of software that manages computer
hardware resources and provides common services for computer programs. The
operating system is a vital component of the system software in a computer
system. Application programs usually require an operating system to function.”
But in other terms we can say Operating system acts as a bridge between
user and interface.


WHAT IS UNIX?
• Kernel: As per the definition from wikipedia
“In computing, the kernel is the main component of most computer operating
systems; it is a bridge between applications and the actual data processing done
at the hardware level. The kernel's responsibilities include managing the system's
resources (the communication between hardware and software components).
Usually, as a basic component of an operating system, a kernel can provide the
lowest-level abstraction layer for the resources (especially processors and I/O
devices) that application software must control to perform its function. It typically
makes these facilities available to application processes through inter-process
communication mechanisms and system calls..”
Kernel converts machine code to human language and human language to
machine code


WHY UNIX?
• Open Source:
• Unix provides an open source code, so one can modify code as per the requirement.
This gives flexibility to end users, programmers and system administrators to tune /
mod the system as per requirement.

• Tools and Utilities:
• Unix comes with plenty of tools and utility to work with. You will learn about
frequently used tools during next few sessions.

• Multiuser and Multi Tasking Abilities:
• Unix comes with multi user and multi tasking support.


WHY UNIX?
• Portability:
• Unix can be used on different environment with less or no configuration.

• Networking Support:
• Unix comes with an excellent networking support which makes it easy to use over
networks.

• Protected Memory:
• If a program crashes, it does not shut down the entire machine, it only affects the
part of memory the program was using when it crashed. Because of this, UNIX
systems are more reliable than Macs or PCs. They can go months without rebooting.
Although CMGM and PMGM are rebooted about once a week just to clean up any
problems that may be hanging around.


UNIX STRUCTURE

User

Shell

Kernel

Hardware


UNIX SYSTEM - HISTORY

Source: www.unix.og


UNIX VARIANTS


UNIX CONTRIBUTORS
Name Contributions to Unix
B, bas, Fortran
Ken Thompson
(with Ritchie), ed, roff, sort, grep, uniq, plot, sa, dd
C, fork-exec, set-userid, db, ed, I/O stream in v8;
Dennis Ritchie (with Thompson) fc (fortran iv);
(with Johnson), port to Interdata
Joe Osanna n/troff
typo, math library, primes, factor, crypt
Bob Morris
(with Cherry) dc-bc
Doug McIlroy tmg, speak, diff, join, look. dict, spell
Lorinda Cherry eqn (startup), parts
Steve Johnson yacc, lint, portable C, spell
comm, qsort, sed, grep, index, cref, cu, architect for
Lee McMahon
Datakit
Brian Kernighan name UNIX, notion of tools, ratfor, eqn, awk, pic. dvi troff


UNIX CONTRIBUTORS
adb, Bourne shell
Steve Bourne extended and named Unix Circuit Design System (UCDS)

-ms, tbl, refer, lex, uucp, apnews, weather
Mike Lesk
(with Kernighan) learn
f77, make
Stu Feldman
(with Andy Hall) efl
Peter Weinberger awk, I/O lib for f77, mp, afactor, cbt (B-tree lib)
Datakit, nfs, ufs
A.G. (Sandy) Fraser original version of UCDS

UCDS
Joe Condon

Al Aho awk, egrep, fgrep, language theory and algorithms


UNIX CONTRIBUTORS
Greg Chesson communications, mpx, con, dcon,
Berk Tague USG
Joe Maranzano USG
Dick Haight PWB
Ted Dolotta PWB
bitblt
John Reiser (with Tom London) port to VAX + paging, V32 system -->
Berkeley
P.J. (Bill) Plauger tools


UNIX VARIANT
• For this training we will use CentOS 6 for Unix environment.


END OF CHAPTER 1
• We will see following in chapter 2
• How to access and log in to a Unix system?
• How to select and change password?
• How to run basic commands?
• How to communicate with other users?
• How to use simple email program?


Thanks …


Unix Training - 1

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