BASH While Loop Examples

1. How do you write a while loop in bash?
2. What is an example of a while loop?
3. Do while loops Unix shell script example?
4. How do you break out of a while loop in bash?
5. How do I read a while loop in Linux?
6. How do you end a while loop?
7. What is Loop example?
8. What does while loop mean?
9. What is while loop in C++ with examples?

How do you write a while loop in bash?

Create a bash file named while1.sh which contains the following script.

1. n=1. while [ $n -le 5 ] do. echo "Running $n time" (( n++ )) done.
2. n=1. while [ $n -le 10 ] do. if [ $n == 6 ] then. echo "terminated" break. fi. echo "Position: $n" ...
3. n=0. while [ $n -le 5 ] do. (( n++ )) if [ $n == 3 ] then. continue. fi. echo "Position: $n"

What is an example of a while loop?

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".

Do while loops Unix shell script example?

Example. Each time this loop executes, the variable a is checked to see whether it has a value that is less than 10. If the value of a is less than 10, this test condition has an exit status of 0. In this case, the current value of a is displayed and later a is incremented by 1.

How do you break out of a while loop in bash?

You can use the break command to exit from any loop, like the while and the until loops. The loop runs until it reaches 14 then the command exits the loop. The command exits the while loop, and that happens when the execution reaches the if statement.

How do I read a while loop in Linux?

The following syntax is used for bash shell to read a file using while loop:

1. while read -r line; do. echo "$line" ; done < input.file.
2. while IFS= read -r line; do. echo $line; done < input.file.
3. $ while read line; do. echo $line; done < OS.txt.
4. #!/bin/bash. filename='OS.txt' n=1. ...
5. #!/bin/bash. filename=$1. while read line; do.

How do you end a while loop?

The break statement exits a for or while loop completely. To skip the rest of the instructions in the loop and begin the next iteration, use a continue statement. break is not defined outside a for or while loop. To exit a function, use return .

What is Loop example?

A loop is used for executing a block of statements repeatedly until a particular condition is satisfied. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration.

What does while loop mean?

In most computer programming languages, a do while loop is a control flow statement that executes a block of code at least once, and then either repeatedly executes the block, or stops executing it, depending on a given boolean condition at the end of the block.

What is while loop in C++ with examples?

In while loop, condition is evaluated first and if it returns true then the statements inside while loop execute, this happens repeatedly until the condition returns false. When condition returns false, the control comes out of loop and jumps to the next statement in the program after while loop.