This course provides the necessary skills to write effective shell scripts to automate the administrative functions in a UNIX environment

Upon completion of this course, students should be able to:

· Identify features of Bourne and bash shells
· Write real world administration scripts
· Write reporting scripts
· Maintain existing scripts
· Use flow control constructs, such as branching and looping
· Customize system-wide shell initialization files
· Develop and debug scripts
· Use local and environmental variables and shell metacharacters in scripts
· Develop interactive scripts
· Write a script that uses functions
· Write scripts that uses functions & traps
· Access and process command-line arguments passed into a script
· Write sed scripts to perform noninteractive editing tasks
· Write nawk scripts to manipulate individual fields within a record
· Write nawk scripts to write reports based upon an input file
· Perform string manipulation and integer arithmetic on shell variables
· Develop a USAGE message to display when a script in invoked incorrectly
· Identify considerations for using functions
· Identify the features of signals
· Perform the action to trap signals
· Learn to download custom made scripts and use them

Included Labs

Labs will be provided by the trainer

Minimum Prerequisites

The participants should be able to use basic UNIX commands and be familiar with vi editor

What will you learn?

Lesson1 - UNIX Shells and Shell Scripts
· Describe the role of shells in the UNIX environment
· Describe the standard shells
· Define the components of a shell script
· Write a simple shell script
· Set access permissions on a file
· Sequence the steps for scheduling processes using crontab
· Schedule a process by using the at command
· Writing and Debugging Scripts
· Start a script with #!
· Put comments in a script
· Change permissions on a script and execute the script
· Debug a script

Lesson 2 - The Shell Environment
· Bourne and Korn shell variables
· Set and unset shell and environment variables
· Customize the user environment using the .profile file
· Perform arithmetic operations
· Create and use aliases
· Define the built-in aliases
· Customize the Bourne and Korn shell environments
· Use the tilde expansion and command substitution features of the Korn shell
· Use and describe regular expressions
· Usage of the grep command

Lesson 3 - The sed Editor and nawk command
· Use the sed editor to perform noninteractive editing tasks
· Use regular expression characters with the sed command
· Use nawk commands from the command line
· Write simple nawk programs to generate data reports from text files
· Write simple nawk programs to generate numeric and text reports from text files
· Conditionals
· Use the exit status of a command as conditional control
· Use the "if" statement to test a condition
· Pass values using command-line arguments (positional parameters) into a script
· Create USAGE messages
· Place parameters on the command line
· Use conditional if, then, elif, else, and fi constructs
· Use exit, let, and test statements ([[ ]], " ")
· Apply the &&, ||, and ! Boolean logic operators
· Use the case statement

Lesson 4 - Interactive Scripts
· Use the print and echo commands to display text
· Use the read command to interactively assign data to a shell variable
· Read user input into one or more variables, using one read statement
· Perform the action to parse a command line input by using the getopts command
· Use special characters, with print and echo, to make the displayed text more user friendly
· Create a "here" document
· Use file descriptors to read from and write to multiple files

Lesson 5 - Loops
· Write scripts that use for, while, and until loops
· Write a script using the select statement
· Describe when to use loops within a script
· Generate argument lists using command, variable, and file-name substitution
· Advanced Variables, Parameters, and Argument Lists
· Declare strings, integers, and array variables
· Manipulate string variables
· Change the values of the positional parameters using the set statement within a script
· Use Korn shell arrays
· Set default values for parameters
· Use the Korn shell built-in let, print, set, and typeset statements

Lesson 6 - Functions
· Create user-defined functions in a shell script
· Create, invoke, and display functions from the command line
· Pass arguments into a function
· Call functions from special (function) files that are saved in one or more function directories
· Describe where functions are available for use

Lesson 7 - Traps
· Describe how the trap statement works
· Include trap statements in a script
· Use the trap statement to catch signals and handle errors
· Introduction to Korn Shell scripting
· Introduction to C Shell scripting
· Introduction to scripting using Perl
· Downloading sample scripts
· Project