POSIX Shell Programming (H4322S)

COURSE OVERVIEW

This course provides UNIX® users and administrators hands-on skills development in POSIX shell programming. Syntax and constructs of the POSIX shell language are covered including use of variables, branches, loops, file I/O, functions, and traps. An introduction to regular expressions, awk, and sed are also discussed as each of these are commonly used in shell scripts. The 5-day course is 50 percent lecture and 50 percent hands-on labs using HP servers.

AUDIENCE

• HP-UX and UNIX general users, system and network administrators, and software developers

PREREQUISITES

• Fundamental knowledge of programming and
• UNIX Fundamentals (51434S) or
• Equivalent experience

COURSE OBJECTIVE

At the conclusion of this course you should be able to:

• Read and maintain existing POSIX scripts
• Create a POSIX program
• Use looping and branching
• Use arrays
• Use regular expressions
• Use subroutines
• Use advanced data structures and functions
• Understand and use traps and signals
• Understand awk and sed

BENEFITS TO YOU

• Understand and maintain POSIX scripts already in use in your environment
• Learn how to create and run a POSIX shell program, saving time and increasing productivity with automated scripts
• Write efficient programs by understanding how shell scripts are processed
• Customize shell start-up files
• Easily control your administration tasks

DETAILED COURSE OUTLINE

Introduction to POSIX Shell Scripts

• What is a shell script?
• Script execution
• The subprocess environment
• Shell features

Shell Scripting

• Which shell?
• Recommended script format
• Planning to write a shell script
• Portability issues

Variables

• Variables
• Displaying and using variables
• Concatenation and substrings
• Other sources of data for variables

User Input

• Reading user input
• Positional parameters
• Creating positional parameters
• Conditional substitution
• External influences

Designing Program Output

• Variable attributes
• Formatted data
• Cursor positioning and terminal echo

Shell Arithmetic

• Creating integer-only variables
• Base10 and others
• Working with arithmetic operators and data

Branches and Logic Testing

• Logic testing
• Conditional operators
• Multiway decision branching and the case statement

Shell Patterns

• Basic expressions
• More complex patterns
• Pattern combinations

Program Loops

• The while loop
• The until loop
• The for loop
• Breaking out of a loop
• Continue and exit commands
• The select loop

The getopts Command

• Processing arguments
• The getopts and OPTARG variable
• The OPTIND variable

Array Variables

• Substituting and counting
• Using integer variables as element numbers

Functions and Function Libraries

• Displaying current shell functions
• Declaring and using functions
• Variable scope
• Function libraries and recursion

Managing Input and Output

• File descriptors
• Reading and writing using file descriptors
• Redirecting, parameter lists, and here documents
• Creating parameter lists from input lines

For more information about HP training programs in Ukraine visit web site at http://www8.hp.com/ua/ru/training/index.html

For whom it is intended:

• System administrator