When to use a while loop in AWK?
When loops are included in a awk script or command, the loop executes one time for each record that is processed. For each record, the loop executes until the condition fails. The while loop is the simplest loop available. It tests the same types of conditions that were used by the if statement.
How is a while action executed in AWK?
while (condition) action. AWK first checks the condition; if the condition is true, it executes the action. This process repeats as long as the loop condition evaluates to true. For instance, the following example prints 1 to 5 using while loop −.
How to use shell variables in an AWK script?
#Getting shell variables into awk may be done in several ways. Some are better than others. This should cover most of them. If you have a comment, please leave below. v1.5 ##Using -v (The best way, most portable) Use the -v option: (P.S. use a space after -v or it will be less portable.
Can a conditional statement be used in AWK?
Conditionals, such as the if statement and loops, such as the following can also be used in awk programming. The if statement can have two branches: an if branch and an else branch.
How is a DO WHILE loop similar to a while loop?
The do-while loop is similar to the while loop, except that the test condition is evaluated at the end of the loop. Here is the syntax of do-while loop − In a do-while loop, the action statement gets executed at least once even when the condition statement evaluates to false.
When is the condition false in a while loop?
For example, suppose that the condition is false for a while loop and for a do while loop. In the while loop, the condition is tested first and because it is false, the body of the loop is not executed. In the do while loop, the body of the loop executes first, and then the condition is tested.
When to use continue statement in AWK script?
For instance, the following example uses continue statement to print the even numbers between 1 to 20. It is used to stop the execution of the script. It accepts an integer as an argument which is the exit status code for AWK process. If no argument is supplied, exit returns status zero.
How to read file line by line using AWK?
I want to read this file line by line using awk as while loop takes much time to process
How to loop through a file to get every line?
So it would be very strange to have a loop like for (i = 1; i<= NR; i++) in an awk script: when awk goes through the first line this executes the loop body for i=1, then awk goes through the second line and the loop body is executed for i=1 and i=2, then awk goes through the second line and the loop body is executed for i=1 and i=2 and i=3, etc.