The break Statement The break statement allows you to exit the current loop. It is often used in an if statement that is contained within a while loop, with the condition in the while loop always evaluating to true. This is useful if the number of times the loop is executed depends on input from the user and not some predetermined number. The break statement exits out of the innermost loop in which it is contained. $ cat break.ksh #!/bin/ksh # Script name: break.ksh typeset -i … [Read more...] about How to use “break” and “continue” statements in shell scripts
The until Loop The until loop is very similar to the while loop, except that the until loop executes as long as the command fails. After the command succeeds, the loop exits and execution of the script continues with the statement following the done statement. The syntax for the until loop is: until control_command do statement1 ... statementN done The control_command can be any command that exits with a success or failure status. The statements can be any utility … [Read more...] about How to use until loop in Shell Scripts
The while loop allows you to repeatedly execute a group of statements while a command executes successfully. The syntax for the while loop is: while control_command do statement1 ... statementN done where, control_command can be any command that exits with a success or failure status. The statements in the body of the while loop can be any utility commands, user programs, shell scripts, or shell statements. When a while statement is executed, the … [Read more...] about “while” Loop Examples in Shell Scripts
Introduction In this article, I will explain you 6 Bash shell command line Chaining Operators (Linux operator). Now let’s discuss what is chaining operator. Chaining operator is something which helps to run multiple commands at once like we execute a script and task completes automatically. Usually, people use Bash shell command line Chaining Operators (Linux operator) in shell scripting but also we can use these operators on shell prompt. Here we are going to discuss on below Bash shell … [Read more...] about 6 Bash Shell Command Line Chaining Operators in Linux
What Is a Shell? A shell is a program that provides an interface between a user and an operating system (OS) kernel. An OS starts a shell for each user when the user logs in or opens a terminal or console window. What Is a Shell Script? A shell script is a file that contains shell and UNIX commands. Similar to compiled executable programs, the shell script has a specific purpose and is reusable. When the commands in the shell script are ordered and error-free, you can execute the shell … [Read more...] about What are Shell Scripts? How to Create Shell Scripts?
The execution of scripts is made versatile by the ability to run a script based on arguments supplied on the command line. In this way, the operation of the script varies depending on what arguments are given to the script. The shell automatically assigns special variable names, called positional parameters, to each argument supplied to a script on the command line. The positional parameter names and meanings are shown in Table below. Positional Parameter Name Returns true (0) if: $0The … [Read more...] about Understanding Positional Parameters (Passing Parameters/Arguments to Shell script)