Page 160 - DCAP602_NETWORK_OPERATING_SYSTEMS_I

Network Operating Systems-I Manmohan Sharma, Lovely Professional University

notes unit 9: file system commands

contents
Objectives
Introduction
9.1 File System Commands

9.1.1 The /etc/passwd File
9.1.2 The /etc/shadow File
9.1.3 The /etc/group File
9.2 Environment Variables
9.3 Summary

9.4 Keywords
9.5 Self Assessment
9.6 Review Questions
9.7 Further Readings

objectives

After studying this unit, you will be able to:

l z Understand file system commands
l z Discuss Environmental Variables

introduction

In this unit, we will discuss file system commands such as etc/passwd file, etc/shadow file, etc.
Also you will understand the concept of environment variables.
9.1 file system commands

Files those hold users’ information are as follows:
1. etc/passwd – Where the user’s name, and other pertinent information are stored. This
includes the password unless your system is using shadow passwords.
2. /etc/shadow – Where the user’s password is stored if you are using shadow passwords.
3. /etc/group – Where group names are stored.
4. /etc/aliases – Where the user’s name is matched to a nickname for e-mail.
5. /etc/sudoers – A list of users with special privileges along with the commands they can
execute.

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