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UNIX Shells and Shell Scripts Role of shells in the UNIX environment Standard shell Components of a shell script write a simple shell script Writing and Debugging Scripts Start a script with # Put comments in a script Change permissions on a script Execute a script Debug a script The Shell Environment Reviewing User Startup Script Shell User Environment A Review of Variables Special Shell Variable Creating Variables in the Shell Exporting Variables to Sub shells  Reserved Variable  Review of Quoting Characters Shell Command Substitution  Korn Shell Tilde Expansion Arithmetic Operations on Bourne Shell Variables Arithmetic Precedence The Korn Shell let Statement  Korn Shell Aliases Built-in Aliases Shell Parse Order Use Bourne and Korn shell variables Assign values to shell variables Display the value of shell variables  Make variables available to sub processes using the export statement Display the value of environment variables Unset shell and environment variables Customize the user environment using the .profile file Perform arithmetic operations  Create and use aliases  Display aliases and the values assigned to them Define the built-in aliases Customize the Bourne and Korn shell environments Use the tilde expansion and command substitution features of the Korn shell Regular Expressions and the grep Command Use and describe regular expressions The grep command Use the grep command to find patterns in a file  Use the regular expression characters with the grep command The sed Editor Use the sed editor to perform non interactive editing tasks Use regular expression characters with the sed command The awk Programming Language Use awk commands from the command line Write simple awk programs to generate data reports from text file Write simple awk 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, else if, else, and if constructs Use exit, let, and test statements ([[ ]], ") Apply the &&, ||, and! Boolean logic operators Use the case statement 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 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 Loops   Write scripts that use for, while, and until loops Write a script using the select statement When to use loops within a script Generate argument lists using command, variable, and file-name substitution  Select and get opts 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 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 Where functions are available for use Traps How the trap statement works Include trap statements in a script Use the trap statement to catch signals and handle errors Real-time production environment scripts (applications level and administration level) sharing.