Shell Programming for System Programmers

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code.

SL-120

length.

5 days

type.

Instructor-Led

partner.

Sun Microsystems

price.

$1,995 :: contact for GSA GOV.

The Shell Programming for System Programmers course provides students with the knowledge to read, write, and debug C shell scripts. Students are taught how to develop simple scripts to automate frequently executed sequences of commands, and how to use conditional logic, user interaction, loops, and menus to enhance the productivity and effectiveness of the user. This course is intended for programmers who are familiar with the Solaris Operating System and who would like to read and understand various C shell scripts, and write their own shell scripts to automate their day-to-day tasks. This course explores in detail the C shell scripting language.

There are currently no scheduled dates for this course. If you are interested in this course, request a course date with the links below.

who can benefit

Programmers interested in C shell programming.

prerequisites

	Use UNIX commands including, but not limited to: rm, cp, man, more, mkdir, ps and chmod
	Create and edit text files in a text editor
	Have a basic understanding of processes, including an understanding of the relationship between parent and child processes
	Modify file permissions

skills gained

	Read, write, and debug scripts
	Use local and environmental variables and shell metacharacters in scripts
	Use regular expression characters with the grep, sed, and nawk utilities
	Write sed scripts to perform non-interactive editing tasks
	Write nawk scripts to manipulate individual fields within a record and to write reports based upon an input file
	Use the exit status of a command to determine if the command succeeded or failed
	Access and process command-line arguments passed into a script
	Develop a USAGE message to display when a script is invoked incorrectly
	Use flow control constructs, such as branching and looping
	Perform string manipulation and integer arithmetic on shell variables

course content details

	Module 1: 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

	Module 2: Writing and Debugging Scripts

	Start a script with #!/bin/csh
	Put comments in a script
	Put commands in a script
	Change permissions on the script file
	Execute a script
	Debug a script

	Module 3: Shell Variables and Initialization Files

	Use C shell variables
	Assign values to shell variables
	Display the value of shell variables
	Make variables available to subprocesses using setenv
	Display the value of environment variables
	Unset shell and environment variables
	Describe the differences between a null variable and a variable whose value has not been set
	Customize the user environment using the .login, .cshrc, and .logout files
	Create and use aliases
	Display aliases and the values assigned to them
	Customize the C shell environment

	Module 4: Regular Expressions and grep

	Use and describe regular expressions
	Describe the grep command
	Use the grep command to find patterns in a file
	Use the regular expression characters with the grep command

	Module 5: The sed Editor

	Use sed to perform noninteractive editing tasks
	Use regular expression characters with the sed command

	Module 6: The nawk Programming Language

	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

	Module 7: Variables, Parameters, and Argument Lists

	Declare string and array variables
	Perform arithmetic operations using @
	Remove selected portions of a string
	Use C shell arrays
	Pass values using command-line arguments (positional parameters) into a script

	Module 8: Conditionals

	Use the exit status of a statement as conditional control
	Use the if statement to test a condition
	Create USAGE messages
	Place arguments on the command line
	Use conditional constructs if, then, else, and endif
	Use exit statements
	Apply Boolean logic \|\|, and !
	Use the switch statemen

	Module 9: Interactive Scripts

	Use the echo statement to display text
	Use special characters with echo to make the displayed text more user-friendly
	Create a here document
	Use redirection to read from and write to multiple files

	Module 10: Loops

	Write scripts that use foreach, while, and repeat loops
	Describe when to use loops within a script
	Generate argument lists using command, variable, and file-name substitution

	Module 11: Controlling Script Behavior

	Use the onintr statement
	Manage the use of temporary files
	Write scripts using the setuid bit
	Use C shell job control functions
	Use the crontab command