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R16 - JNTUK - EEE - Unix & Shell Programming (Unit-5 (The Expr Command…
R16 - JNTUK - EEE - Unix & Shell Programming
Unit-1
Introduction to unix
Brief History
What is Unix
Unix Components
Using Unix-Commands in Unix
Some Basic Commands
Command Substitution
Giving Multiple Commands
Unit-2
The File system
The Basics of Files
What’s in a File
Directories and File Names
Permissions
I Nodes
The Directory Hierarchy
File Attributes and Permissions
The Chown Command Changing the Owner of a File
The Chgrp Command Changing the Group of a File
Unit-3
Using the Shell-Command Line Structure
Met characters
Creating New Commands
Command Arguments and Parameters
Program Output as Arguments
Shell Variables
More on I/O Redirection
Looping in Shell Programs
Unit-4
Filters-The Grep Family
Other Filters
The Stream Editor Sed
The AWK Pattern Scanning and processing Language
Good Files and Good Filters
Unit-5
Shell Programming-Shell Variables
The Export Command
The Profile File a Script Run During Starting
The First Shell Script
The read Command
Positional parameters-The $?
Variable knowing the exit Status
More about the Set Command
The Exit Command
Branching Control Structures
Loop Control Structures
The Continue and Break Statement
The Expr Command
Performing Integer Arithmetic
Real Arithmetic in Shell Programs
The here Document(<<)
The Sleep Command
Debugging Scripts
The Script Command
The Eval Command
The Exec Command
Unit-6
The Process-The Meaning
Parent and Child Processes
Types of Processes
More about Foreground and Background processes
Internal and External Commands
Process Creation
The Trap Command
The Stty Command
The Kill Command
Job Control
Prepared by: Srinivas Adapa, Associate Professor, CSE Department, CITM