How do you run a while loop in shell script?

How do you run a while loop in shell script?

The general syntax as follows for bash while loop:

1. while [ condition ] do command1 command2 commandN done.
2. while [[ condition ]] ; do command1 command1 commandN done.
3. while ( condition ) commands end.
4. #!/bin/bash c=1 while [ $c -le 5 ] do echo “Welcone $c times” (( c++ )) done.

What is the syntax of while loop in shell programming?

Syntax. Here the Shell command is evaluated. If the resulting value is true, given statement(s) are executed. If command is false then no statement will be executed and the program will jump to the next line after the done statement.

How do I run a csh script in terminal?

There are three ways:

1. Execute csh directly and then enter script commands interactively.
2. Store a group of csh commands in the file ‘myScript’ and execute it using: % csh myScript …
3. Begin the script with the line #!/usr/bin/csh where ‘…’ is again the arguments to the shell.

Which two commands are used for looping?

To alter the flow of loop statements, two commands are used they are,

• break.
• continue.

How does a Do While loop work in C?

A do while loop is similar to while loop with one exception that it executes the statements inside the body of do-while before checking the condition. On the other hand in the while loop, first the condition is checked and then the statements in while loop are executed.

How do you use a while loop in Linux?

The while loop is used to performs a given set of commands an unknown number of times as long as the given condition evaluates to true. The while statement starts with the while keyword, followed by the conditional expression. The condition is evaluated before executing the commands.

What is csh command?

The C shell (csh) is a command shell for Unix-like systems that was originally created as part of the Berkeley Software Distribution (BSD) in 1978. Csh can be used for entering commands interactively or in shell scripts.

How do I make my csh script executable?

You can make the script an executable program. (I’m going to repeat some of what others have already written.) Add a “shebang” as the first line. For a csh script, use #!/bin/csh -f .

What is a while loop statement?

A “While” Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don’t know how many times the user may enter a larger number, so we keep asking “while the number is not between 1 and 10”.

How do you end a while loop in Linux?

Breaking from a while Loop Use the break statement to exit a while loop when a particular condition realizes. The following script uses a break inside a while loop: #!/bin/bash i=0 while [[ $i -lt 11 ]] do if [[ “$i” == ‘2’ ]] then echo “Number $i!” break fi echo $i ((i++)) done echo “Done!”

How do I run a csh script in Windows?

Execute Shell Script Files

1. Open Command Prompt and navigate to the folder where the script file is available.
2. Type Bash script-filename.sh and hit the enter key.
3. It will execute the script, and depending on the file, you should see an output.

What is exec csh?

csh. exec executes command in place of the current shell, which terminates. eval reads its argument s as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as the result of command or variable substitution.

Do while loop in C examples?

There is given the simple program of c language do while loop where we are printing the table of 1.

• #include
• int main(){
• int i=1;
• do{
• printf(“%d \n”,i);
• i++;
• }while(i<=10);
• return 0;

How do while loops work in C?

C – while loop

1. step1: The variable count is initialized with value 1 and then it has been tested for the condition.
2. step2: If the condition returns true then the statements inside the body of while loop are executed else control comes out of the loop.