linux seminar(1st april 2011)

8/7/2019 LINUX SEMINAR(1ST APRIL 2011)

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BY ABHISHEK KUNALRAVI KUMAR

PRAVIN KUMAR


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Understanding LINUX

File system of LINUX

User Management Permission

DNS pointing

WEB hosting

HACKING(PHISHING)....


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An operating system (OS) is software,consisting ofprograms and data, that runs oncomputers and manages computer hardwareresources and provides common services for

efficient execution of various applicationsoftware.
http://en.wikipedia.org/wiki/Softwarehttp://en.wikipedia.org/wiki/Computer_programhttp://en.wikipedia.org/wiki/Datahttp://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Datahttp://en.wikipedia.org/wiki/Computer_programhttp://en.wikipedia.org/wiki/Software


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MULTI-USER PERFORMANCE

WIDELY USED IN SERVER HOSTING

SECURITY


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COMMANDS useradd (username)

passwd (username)

The file /etc/passwd contains all informationregarding the user (login, passwords, etc.). /etc/shadow file stores actual password inencrypted format for user's account withadditional properties related to user password.


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Two types of encryption is done:

Privelege level 7

Md-5

The privelege level-7 password can bedecrypted by many softwares.


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In cryptography, a Caesar cipher, also knownas a Caesar's cipher, the shift cipher, Caesar'scode or Caesar shift, is one of the simplestand most widely known encryption

techniques. It is a type ofsubstitution cipherin which each letter in the plaintext isreplaced by a letter some fixed number ofpositions down the alphabet.
http://en.wikipedia.org/wiki/Cryptographyhttp://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Substitution_cipherhttp://en.wikipedia.org/wiki/Plaintexthttp://en.wikipedia.org/wiki/Alphabethttp://en.wikipedia.org/wiki/Alphabethttp://en.wikipedia.org/wiki/Plaintexthttp://en.wikipedia.org/wiki/Substitution_cipherhttp://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Cryptography


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READ : User can look at the contents of thefile.

WRITE : User can modify the contents of thefile.

EXECUTE :User can use the filename as a UNIXcommand.


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COMMAND

chmod (data bit) (file name)


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The DOMAIN NAME SYSTEM is a phone bookfor a internet by translating hostname into IP.

DNS server distribute the responsibility byassigning domain name mapping those nameto IP address.


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A top-level domain (TLD) is one of the domains atthe highest level in the hierarchical Domain NameSystem of the Internet.

Management of most top-level domains is

delegated to responsible organizations by theInternet Corporation for Assigned Names andNumbers (ICANN), which operates the InternetAssigned Numbers Authority (IANA) and is incharge of maintaining the DNS root zone.
http://en.wikipedia.org/wiki/Domain_namehttp://en.wikipedia.org/wiki/Domain_Name_Systemhttp://en.wikipedia.org/wiki/Domain_Name_Systemhttp://en.wikipedia.org/wiki/Internethttp://en.wikipedia.org/wiki/Internet_Corporation_for_Assigned_Names_and_Numbershttp://en.wikipedia.org/wiki/Internet_Corporation_for_Assigned_Names_and_Numbershttp://en.wikipedia.org/wiki/Internet_Assigned_Numbers_Authorityhttp://en.wikipedia.org/wiki/Internet_Assigned_Numbers_Authorityhttp://en.wikipedia.org/wiki/DNS_root_zonehttp://en.wikipedia.org/wiki/DNS_root_zonehttp://en.wikipedia.org/wiki/Internet_Assigned_Numbers_Authorityhttp://en.wikipedia.org/wiki/Internet_Assigned_Numbers_Authorityhttp://en.wikipedia.org/wiki/Internet_Corporation_for_Assigned_Names_and_Numbershttp://en.wikipedia.org/wiki/Internet_Corporation_for_Assigned_Names_and_Numbershttp://en.wikipedia.org/wiki/Internethttp://en.wikipedia.org/wiki/Domain_Name_Systemhttp://en.wikipedia.org/wiki/Domain_Name_Systemhttp://en.wikipedia.org/wiki/Domain_name


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This group of domains is commonly known ascountry-code top-level domains (ccTLD).
http://en.wikipedia.org/wiki/Country-code_top-level_domainhttp://en.wikipedia.org/wiki/Country-code_top-level_domainhttp://en.wikipedia.org/wiki/Country-code_top-level_domainhttp://en.wikipedia.org/wiki/Country-code_top-level_domainhttp://en.wikipedia.org/wiki/Country-code_top-level_domainhttp://en.wikipedia.org/wiki/Country-code_top-level_domain


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The most common use of web server is tohost websites.

The common request is HTTP to the webserver (ex http://www.demo.com)

A client uses web browser to do http requestto the web server.

For a static request the URL path specified by

the client is relative to the webserver rootdirectory.(exhttp://www.prist.ac.in/index.html)
http://www.demo.com/http://www.demo.com/


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Webmin is a program that simplifies theprocess of managing a Linux or UNIX system.Traditionally,you have to manually editconfiguration files and run commands tocreate accounts, set up web servers dnsserver.


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Apache is the Internets most popular HTTPserver, due to its zero cost, wide availability,and large feature set.

All Linux distributions include it as a standardpackage, and it can be installed on orcompiled for every other UNIX variantsupported by Webmin.


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linux seminar(1st april 2011)

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