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PRESENTATION OVERVIEW About Shell Scripting Variables in Shell Scripting Variable declaration Unix Shell Scripting Contents Standard wildcard Loops in Shell Scripting Types of loops Test-driving Shell Scripts Call A Function In Shell Scripting External Programs Interactive Shell Scripts
ABOUT SHELL SCRIPTING A shell script is known as the human readable text file which mainly contains the collection of commands. It can also be manually executed step by step at the UNIX operating system. Thus the vi program or any of the UNIX editors out there which can be mainly used to create the shell script and store it to the disk for execution.
VARIABLES IN Â SHELL SCRIPTING Variables are the primary process of any script or the program. It is an easy way to check out the amount of the data in memory which can be mainly modified. Thus the variable in a different script can be allotted any values like a number or the text string.
VARIABLE DECLARATION For the information in the field of UNIX to create the variable one must place in the script. “VARIABLE_NAME=value” Hence the VARIABLE_NAME will be anything the user wants, and it also contains the letters, numbers as well as “_.”
UNIX Â SHELL SCRIPTING CONTENTS It is very useful in various ways for the many users as well as Linux system. Thus the commands can use the wildcards to performing the action on file which is said to be the more than a file at a time. The users should know that there are two different ways are used for the Wildcards.
STANDARD WILDCARD They are standard wildcard which is often utilized by the shell whereas the alternative is the general expressions on the other side it is familiar with the major commands for use with manipulation and the text searching. For example, if the user wants to create a file for “process” with wildcard expressions then create it as ‘process*.
LOOPS IN SHELL SCRIPTING The loop is said to be the powerful tool which is mainly enabled to run the set of commands continuously. Thus the while loop is mainly executing the commands which are given until the condition remains genuine and until loop will repeatedly execute until the given condition is true.
 TYPES OF LOOPS There are different types of loops available in the shell. They are 1) While Loop 2) For Loop 3) Until Loop 4) Select Loop
TEST-DRIVING SHELL SCRIPTS The test command from the UNIX which primarily evaluates the expression of the parameter. In most of the past shell implementations, that is the shell builtin where the external version also mainly exists. The second form of the command like brackets will be surrounded by the blank spaces. The user must help to test the explicitly for the file names in the shell.
CALL A FUNCTION IN SHELL SCRIPTING Thus the function is mainly enabling the user to break down the entire functionality of the script. converted to logical subsections, smaller and then it can be called as to perform the specific tasks if they need. Thus the function is mainly used to carry out the continuous tasks in an excellent way of creating the code reuse.
EXTERNAL PROGRAMS The external programs are mainly used for the shell scripts, and there are few building commands like a test, which and echo are typical. On the other side, one must know that the commands are said to be the UNIX utilities they are cut, expr, grepa and tr. Thus the backtick is usually connected often with the external commands.
INTERACTIVE SHELL SCRIPTS An interactive shell primarily interacts with the user input and the user. Thus the user types of input where the script mainly validates the input to make sure which it belongs to the correct format. Once the validating is complete with the input, the shell script will directly make text processing on the string.
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