Shell Scripting

How to Use File Descriptors to Read From and Write to Multiple Files in Linux

File Input and Output A script can receive input from a file and send output to a file so that the script can run …

Input and Output in a Script While some scripts run without any interaction with the user, many scripts require input …

Use the print statement to provide output. Use it wherever you would use the echo statement. It is more versatile than …

Introduction to the awk Programming Language The awk programming language grew out of the recognition that many data …

The case Statement The if/then/else construct makes it easy to write programs that choose between two alternatives. …

Positional Parameters The execution of scripts is made versatile by the ability to run a script based on arguments …

When you write a script and set up user interaction, generally the script expects a certain type of user input. For …

The grep Command Like most UNIX commands, grep is a mnemonic. The grep mnemonic is derived from ex editor commands. The …

The Bourne shell assigns string values to variables only in the assignment statement. The Bourne shell has no built-in …

Place an integer expression in two pairs of parentheses ((…)) to invoke an Arithmetic evaluation. For …

Korn Shell Aliases An alias is a name that you give to a command. You can create an alias in the Korn shell.