until loop example

First, Introduction In shell programming, circular commands are used to control the execution of certain statements under certain conditions, with three commonly used loop statements: for, while, and until. While loops and for loops belong to the

In the for loop described earlier, you must first create an element list to determine the number of cycles. However, consider the following example: If you enter "quit", the program will exit, otherwise, convert the characters entered by the user

Linux Shell series (12) Shell until loop, shelluntil This article is Part 12 of the Linux Shell series tutorials. For more Linux Shell tutorials, see the Linux Shell series tutorials.In the last two articles: Linux Shell series (10) Shell for loop

While loop structureWhile condition-determining expressionDoStatement blocks executed when the condition is judged............DoneExample: Using while to output a number 1 to 10 (ascending output)J=1While [$j-le 10]Do#useradd wsyht$j#userdel-R wsyht$

One, while loop The while loop is used to continuously execute a series of commands and to read data from an input file; a command is usually a test condition. The format is: Copy Code code as follows: While command Todo Command1

The Until loop executes a series of commands until the condition is true. The Until loop and the while loop are just the opposite of the processing mode. The general while loop is better than the until loop, but at some point it is only rare that

The Until loop executes a series of commands until the condition is true. The Until loop and the while loop are just the opposite of the processing mode. The general while loop is better than the until loop, but at some point it is only rare that

This article mainly introduces the Repeat...until Loop statement Usage Tutorial in Lua, is a basic tutorial in Lua's introductory learning, and needs friends to refer to the following Unlike for and while loops, the loop condition is tested at the

The Until loop executes a series of commands until the condition is true. The Until loop and the while loop are just the opposite of the processing mode. The general while loop is better than the until loop, but at some point it is only rare that

Until loop syntax format: Until conditiondo statementdone Note: The condition when until enters the loop is: when the condition is not true, the loop is executed. The condition for until to enter the loop is exactly the opposite of while. The