Bash For Loop Code In You

Really I always thought, that counted variables like i or n have to be (re)used in the command again.

So I asked: and fortunately I landed here and got a helpful tiny function on top.

Bash For Loop Code In You

I hope you have enjoyed making looping around in bash Stay tuned for next week as you will learn how to reuse code in you bash scripts by creating functions.

Learn for, while and until loops with examples in this chapter of Bash Beginner Series.

In this tutorial, you will explore the three different bash loop structures.

You will also learn how to use loops to traverse array elements.

Furthermore, you will learn how to use break and continue statements to control loops, and finally, you will learn how to create infinite loops.

For Loops in Bash For loops are one of three different types of loop structures that you can use in bash.

Hello Friend ListRange For Loops in Bash Another syntax variation of for loop also exists that is particularly useful if you are working with a list of files (or strings), range of numbers, arrays, output of a command, etc.

The listrange syntax for loop takes the following form: for item in LIST; do.

The general syntax for a while loop is as follows: while condition; do.

Inside the body of the while loop, echo command prints of num multiplied by three and then it increments num by 1.

Until Loops in Bash If you are coming from a CC background, you might be looking for a do-while loop but that one doesnt exist in bash.

The until loop follows the same syntax as the while loop: until condition; do.

Done The key difference between until loop and while loop is in the test condition.

A while loop will keep running as long as the test condition is true; on the flip side, an until loop will keep running as long as test condition is false For example, you can easily create the 3x10.sh script with an until loop instead of a while loop; the trick here is to negate the test condition: binbash.

For loops are often the most popular choice when it comes to iterating over array elements.

The break statement terminates the execution of a loop and turn the program control to the next command or instruction following the loop.

For example, the following loop would only print the numbers from one to three: for ((i1;i You can also use a continue statement to skip a loop iteration.

The loop continues and moves to the next iteration but the commands after the continue statements are skipped in that partcular iteration.

For example, the following odd.sh script would only print the odd numbers from one to ten as it skips over all even numbers: binbash.

In most cases, infinite loops are a product of a human logical error.

For example, someone who may want to create a loop that prints the numbers 1 to 10 in descending order may end up creating the following infinite loop by mistake: for ((i10;i0;i)); do.

To fix it, you need to change i with i-- as follows: for ((i10;i0;i--)); do.

You can easily create an infinite for loop as follows: for ((;;)); do.