Shell scripts are short programs that are written in a shell programming language and interpreted by a shell process. They are extremely useful for automating tasks on Linux and other Unix-like operating systems.
A shell is a program that provides the traditional, text-only user interface for Unix-like operating systems. Its primary function is to read commands (i.e., instructions) that are typed into a console (i.e., an all-text display mode) or terminal window (i.e., all-text mode window) and then execute (i.e., run) them. The default shell on Linux is the very commonly used and highly versatile bash.
A programming language is a precise, artificial language that is used to write computer programs, which are sets of instructions that can be automatically translated (i.e., interpreted or compiled) into a form (i.e., machine language) that is directly understandable by a computer's central processing unit (CPU).A feature of bash and other shells used on Unix-like operating systems is that each contains a built-in programming language, referred to as a shell programming language or shell scripting language, which is used to create shell scripts. Among the advantages of using shell scripts are that they can be very easy to create and that a large number are already available in books and on the Internet for use with or without modification for a wide variety of tasks. Shell scripts are also employed extensively in the default installations of Unix-like operating systems.
Unit 1: Introduction Linux Shell Script
Unit 2: Linux Shell Script Fundamental
Unit 3: Environment
Unit 4: Writing script & executing basic script
Unit 5: Variables (default variables),expressions
Unit 6: Conditional statements,Logical operators-AND,OR,NOT
Unit 7: Loops(While,Do While,For,Until,Break & continue)
Unit 8: Command line arguments
Unit 9: Functions & file manipulations
Unit 10: Regular Expression & Filters
Unit 11: Processes(Background processes,Scheduling processes -At, batch & Cron)
Unit 1: Adv. Scripting Techniques(Shell & subshells,Arrays )
Unit 2: Dialog boxes
Unit 3: Remote Shell execution
Unit 4: Connecting to MySQL using shell
Unit 5: Running SQL queries from a shell script
Unit 6: Essential System Administration jobs
Unit 7: Managing disk space/file system
Unit 8: Startup-Shutdown scripts
Unit 9: Backup-cpio-tar
Unit 10: Monitoring , health check