by Yashavant Kanetkar

Unix. Possibly, the longest living entity in the computer land where nothing survives more than a couple of years, a decade at the most. It has been around for more than two decades, owing its lingevity to the ruggedness built into it and its commands. This book has two parts. The first part is a journey into the vast expanse that is Unix. The intent is to make you aware of the underlying philosophy used in development of myriads of Unix commands rather than telling you all the variations available with them. The second part takes you into the murky depths of Shell Programming and System Administration. You would find a detailed coverage of several aspects of Bourne Shell Programming.

Table Of Contents

Getting Started A Unix Biography Hardware Requirements for Unix Sailent features of Unix Multiuser Capability Multitasking Capability Communication Security Portability Unix System Organisation Types of Shells Bourne Shell C Shell Korn Shell The First Faltering Steps Unix Commands What's in the Name? The Unix File System Creating Files Indulging in File Play Listing Files and Directories Masking File Permissions Directory Permissions Still Better Directory Permissions Removing A File Forcibly Other Useful ls Variations Directory Related Commands A Bit of Mathematics Miscellaneous Commands The Unix File System The Boot Block The Super Block The Inode Table Surrogate Super Block and Inode Table How Does Unix Access Files Storage of Files Disk Related Commands Checking Disk Free Space dfspace Makes More Sence Disk Usage - The du Command The ulimit Command Essential Unix Commands Password cal is for Calender The banner Command The touch Command The file Command Links with DOS File Related Commands wc, sort, cut, grep, dd Viewing Files Taking Printouts File Compression The On-line Unix Mannual I/O Redirection and Piping Piping vi, The King of All Editors Why vi Modes of Operation The first Editing Session Learing The Ropes Block Commands Search, Search Everywhere.. Find and Replace Delete and Paste Yank and Paste abbr is for Abbreviate Set Commands Customizing The vi Environment Multiple File Editing in vi Command Line Options in vi Processes in Unix What's Running Right Now Still More Processes Background Processes The nohup Command Killing a processes Changing Process Priorities Scheduling of Processes The at Command The batch Command The crontab Command Communication - Unix Style The write Command The wall Command What's The News Today motd is for Message of The Day Mail: The Basis of Unix Communication Sending mail Handling Incoming Mail Customizing mail Shell Programming - The First Step Before We Start.. When to Use Shell Scripts The First Shell Script Interactive Shell Scripts

Shell Variables Shell Keywords Another way of Assigning Values to Variables Unix-defined or System Variables User-defined Variables Tips and Traps Unchanging Variables Wiping Out Variables Positional parameters Passing Command Line Arguments Setting Values of Positional Parameters Displaying Date in Desired Format Using Shift on Positional Parameters Arithmetic in Shell Script read and echo Revisited The Carriage Return The Tab and The Backspace Positioning The Cursor Bold and Beautiful The tput Command Control Instructions in Shell Taking Decisions The if-then-fi Statement The if-then-else-fi Statement The test Command File Tests String Tests Nested if-elses Forms of if Use of Logical Operators Hierarchy of Logical Operators else + if Equals elif The Case Control Structure The Tips and Traps The Loop Control Structure Loops The while Loop Tips and Traps Friend, Where are You.. The IFS Thing Reading From A File The untill loop The for Loop Using for with Command Line Arguments Creating Nested Directories Generating Values for a for Loop Nesting of Loops The break Statement The continue Statement Shell Metacharacters Filename Substituation Metacharacters Rediretion Metacharacters. Process Execution Metacharacters Conditional Execution Using && and || Quoting Metacharacters. Positional Parameters and Special Parameters Oh! I Forgot.. Debugging a Script $* And $@ Tricks of The Trade Controlling Termial Input Tackling Multiple Command Line Options traping Signals Functions. Executing Multiple Scripts Shell Miscellany Fuctions of A Shell Varibles Revisited Exporting Varibles Controlling Varible assignments The eval Command System Administration Adding and Removing Users Some More Daily Administration Starting Up The System Shutting the System Down Disk Management Formatting A Disk Making A File System Mounting A File System Unmounting A File System Using A Raw Disk Monitoring System Usage Ensuring System Security Providing Assistance to Users Shell Programming Project Payroll Processing System Data Orginasation. Menus Report Formats Calculations Working of The System Program Where Do You Go From Here... Improve This Program..