Annalise  Hyatt

Annalise Hyatt

1594708740

Bash until Loop and Bash until Loop Example

Loops are one of the fundamental concepts of programming languages. Loops are handy when you want to run a series of commands over and over again until a specific condition is met.

In scripting languages such as Bash, loops are useful for automating repetitive tasks. There are 3 basic loop constructs in Bash scripting, [for](https://linuxize.com/post/bash-for-loop/) loop[while](https://linuxize.com/post/bash-while-loop/) loop, and until loop.

This tutorial explains the basics of the until loop in Bash.

Bash until Loop

The until loop is used to execute a given set of commands as long as the given condition evaluates to false.

The Bash until loop takes the following form:

until [CONDITION]
do
  [COMMANDS]
done

Copy

The condition is evaluated before executing the commands. If the condition evaluates to false, commands are executed. Otherwise, if the condition evaluates to true the loop will be terminated and the program control will be passed to the command that follows.

In the example below, on each iteration the loop prints the current value of the variablecounterandincrements the variableby one.#!/bin/bash

counter=0

until [ $counter -gt 5 ]
do
  echo Counter: $counter
  ((counter++))
done

Copy

The loop iterates as long as the counter variable has a value greater than four. The script will produce the following output:

Counter: 0
Counter: 1
Counter: 2
Counter: 3
Counter: 4
Counter: 5

Use the [break](https://linuxize.com/post/bash-break-continue/) and [continue](https://linuxize.com/post/bash-break-continue/) statements to control the loop execution.

#bash #loop #bash until loop

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Bash until Loop and Bash until Loop Example
Annalise  Hyatt

Annalise Hyatt

1594708740

Bash until Loop and Bash until Loop Example

Loops are one of the fundamental concepts of programming languages. Loops are handy when you want to run a series of commands over and over again until a specific condition is met.

In scripting languages such as Bash, loops are useful for automating repetitive tasks. There are 3 basic loop constructs in Bash scripting, [for](https://linuxize.com/post/bash-for-loop/) loop[while](https://linuxize.com/post/bash-while-loop/) loop, and until loop.

This tutorial explains the basics of the until loop in Bash.

Bash until Loop

The until loop is used to execute a given set of commands as long as the given condition evaluates to false.

The Bash until loop takes the following form:

until [CONDITION]
do
  [COMMANDS]
done

Copy

The condition is evaluated before executing the commands. If the condition evaluates to false, commands are executed. Otherwise, if the condition evaluates to true the loop will be terminated and the program control will be passed to the command that follows.

In the example below, on each iteration the loop prints the current value of the variablecounterandincrements the variableby one.#!/bin/bash

counter=0

until [ $counter -gt 5 ]
do
  echo Counter: $counter
  ((counter++))
done

Copy

The loop iterates as long as the counter variable has a value greater than four. The script will produce the following output:

Counter: 0
Counter: 1
Counter: 2
Counter: 3
Counter: 4
Counter: 5

Use the [break](https://linuxize.com/post/bash-break-continue/) and [continue](https://linuxize.com/post/bash-break-continue/) statements to control the loop execution.

#bash #loop #bash until loop

Annalise  Hyatt

Annalise Hyatt

1594795440

Bash For Loop,The Standard Bash for Loop

Loops are one of the fundamental concepts of programming languages. Loops are handy when you want to run a series of commands over and over again until a certain condition is reached.

In scripting languages such as Bash, loops are useful for automating repetitive tasks.

There are three basic loop constructs in Bash scripting, for loop, [while](https://linuxize.com/post/bash-while-loop/) loop, and [until](https://linuxize.com/post/bash-until-loop/) loop.

In this tutorial, we will cover the basics of for loops in Bash. We will also show you how to use the break and continue statements to alter the flow of a loop.

The Standard Bash for Loop

The for loop iterates over a list of items and performs the given set of commands.

The Bash for loop takes the following form:

for item in [LIST]
do
  [COMMANDS]
done

Copy

The list can be a series of strings separated by spaces, a range of numbers, output of a command, an array, and so on.

Loop over strings

In the example below, the loop will iterate over each item in the list of strings, and the variable element will be set to the current item:

for element in Hydrogen Helium Lithium Beryllium
do
  echo "Element: $element"
done

#bash #loop #bash for loop

August  Larson

August Larson

1624331040

Python For Loop (with Examples)

A Python tutorial to understand the uses of for loop in various ways including examples.

Python is a general-purpose programming language, which emphasizes making programming easy, efficient coding, and unleashes the user’s potential. Loops are the vital part of programming as it allows the user to repetitive use a set of codes using loops. So in the following article, we will see how to use for loops in python.

FOR Loop:

Till the iteration of the last item in the sequence, for loop run the instructions. It iterates over sets of instructions in sequence, arrays, and a tuple for a pre-defined period or until the last item and calculation are executed.

For loop can be categorized in three ways.

  1. Traditional for loop – It is usually used in programming language and contains three parts of a loop, i.e., initialization, condition, increment/decrement.
  2. Iterator/collection-based for loop – It is used for the iteration of objects and collections instead of numbers.
  3. Vectorize for loop – It is used to iterate parallel arrays simultaneously.

#python #for loop #loops #loop #python for loop

Jackson  Watson

Jackson Watson

1625660940

Practical Bash: Variables and For Loops in Scripts - Beyond Code Live 009

Using variables and loops we can write scripts that work on a large set of files without writing it all out by hand.

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(Learn to Code in 15 Minutes a Day)
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https://youtu.be/cp6KJKBZq50

#bash #practical bash #loops #scripts #variables and for loops in scripts #webdeveloper

Hudson  Larkin

Hudson Larkin

1599201978

For loop in C++ Program | C++ For Loop Example

For loop in C++ Program | C++ For Loop Example is today’s topic. For understanding for loop, we must have prior knowledge of loops in C++. Loops are used when we want a particular piece of code to run multiple times. We use loops to execute the statement of codes repeatedly until a specific condition is satisfied. It eases the work of the programmer and also shortens the code length.

For loop in C++ Program

For example, if we want to print numbers from 1 to 1000, then if we don’t use loops, we have to write 1000 different print statements for printing numbers from 1 to 1000. With the help of loops, we can write this code in 2 lines. We need to run the loop and give iteration conditions.

There are 3 types of loops for loopwhile loop and do-while loop. In this tutorial, we will learn about for loop.

A for loop is the repetition control structure that is generally used to write a code more efficiently which is supposed to be executed a specific number of times.

#c++ #for loop #while loop #do-while loop