關於 linux while loop ，我們在網路上蒐集到這些相關的討論、資訊與評價

#11. Bash shell script – while 迴圈 - Benjr.tw

print 列印出\t (tab) 與$1 第一欄的資料. root@ubuntu:~# vi while2.sh. #!/bin/bash. while ...

#12. Bash script: While loop examples - LinuxConfig.org

The while loop in a Linux Bash script is a type of loop that continues to execute as long as the programmed condition remains true.

#13. Bash While Loop - Javatpoint

The bash while loop can be defined as a control flow statement which allows executing the given set of commands repeatedly as long as the applied condition ...

#14. Linux While Loops - Burleson Consulting

The while loop checks the conditional statement and notices that i is, in fact, less than or equal to 10, so it executes the code between the do and done ...

#15. Using for loops and while loops in a shell script

As a result, we have for and while loops in the Bourne shell. ... A handy Bash (but not Bourne Shell) tip I learned recently from the Linux From Scratch ...

#16. While loop in bash - YouTube

This video gives you the true and profound understanding of while loops in bash. Watch Full Video for a better understanding and clear your ...

#17. Bash Scripting Part2 - For and While Loops With Examples

Learn Linux shell scripting for & while loops , nested loops, using break & continue commands, redirect loop output, and get directory files ...

#18. How does While Loop Work in Linux? - eduCBA

Linux while loop command is a control flow condition that will help to run the command to execute it repeatedly based on a certain condition.

#19. While Loop and Until Loop - FutureLearn

Bioinformatics for Biologists: An Introduction to Linux, Bash Scripting, and R ... This is what's known as an infinite loop because the condition will always ...

#20. Linux shell script: while loop and sleep example

Second, I pause the program by calling the Unix/Linux sleep command from my Bourne shell script. Sleeping in a shell script while loop. As an ...

#21. Bash while循环 - 易百教程

还可以使用内置命令 true 来创建无限循环，如下所示： #!/bin/bash #An infinite while loop while true do echo "Welcome to Yiibai" done. 上面bash脚本输出与上述 ...

#22. BASH while loop explained with examples | FOSS Linux

The Bash While Loop is a statement used to execute a block of statements repeatedly based on the boolean result of articulation for as long ...

#23. Loops - Bash Scripting Tutorial

Bash loops are very useful. In this section of our Bash Scripting Tutorial we'll look at while loops, until loops and for loops with plenty of sample code.

#24. Bash while loop usage with examples for beginners

Example-2: Use bash while loop with "true" - infinite Loop ... The biggest drawback with such approach is that such script may eat up your system resources so you ...

#25. Bash break: How to Exit From a Loop - phoenixNAP

Use the break statement to exit a while loop when a particular condition realizes. The following script uses a break inside a while loop: #!/bin ...

#26. Bash while Loop | Explained - Its Linux FOSS

The bash while loop is used to check the condition repeatedly while the condition is true. The while loop is used to iterate for specific times and write or ...

#27. Bash Scripting – While And Until Loop Explained With Examples

The functionality of the while loop is similar to for loop. The for loop iterates over a list of items and runs the block of code N a number of ...

#28. While loop not stopping after condition is met (bash/linux)

You're misunderstanding the logical structure of the two loops you have; the while [ "$total_snp" -lt 10 ] loop and the for snp in $snplist ...

#29. while loop and delay - UNIX and Linux Forums

Dear all, if we want to run a command every 5 mins to check if the process is working fine or not... like in c, we can use a simple while loop with a delay ...

#30. The while loop - IBM

It then uses the date command to get the current date and time. Next the script runs a while loop. The test condition says that the loop should keep on going as ...

#31. While loop not outputting to a log file - Unix Stack Exchange

while ... do ... done >> "$log". or after the curl command: curl ... >> "$log"; done. Note also, that you should quote your --header and ...

#32. 'While' and 'until' loops - Introducing UNIX and Linux

Solution: Use a while loop and bc to do the calculations. Set a variable i to start at 1 and then become in turn 2 , 3 , up to 12 ...

#33. Using 'break' and 'continue' to exit loops in bash | Network World

Both the break and the continue commands are meant to be used only in for, while and until loops. In fact, if you try to invoke the break ...

#34. Different Ways to Read File in Bash Script Using While Loop

while loop should start with a while keyword followed by a condition. · A condition should be enclosed within [ ] or [[ ]]. The condition should ...

#35. Loops - Learn Shell - Free Interactive Shell Tutorial

bash while loop ... The while construct tests for a condition, and if true, executes commands. It keeps looping as long as the condition is true. COUNT=4 while ...

#36. Bash Array - While Loop - TutorialKart

To iterate over items of an array in Bash, we can use While loop. In the While loop start with index=0 and execute the loop until index is less than array ...

#37. Syntax error in While loop - command line - Ask Ubuntu

This will happen if your file has Windows style line endings ( \r\n ) instead of regular Unix ones ( \n ). You have probably edited this ...

#38. “while” Loop Examples in Shell Scripts - The Geek Diary

where, control_command can be any command that exits with a success or failure status. The statements in the body of the while loop can be any utility ...

#39. Working with the do while loop | Learning Linux Shell Scripting

Similar to the for command, while is also the command for loop operations. The command next to while is evaluated. If it is successful or 0 then the commands ...

#40. Bash For Loop and While Loop Examples - DevQA.io

Bash also support while loops. While loops execute a set of instructions until a condition evaluates to true. ... The condition is evaluated ...

#41. 7 Examples of How to use While Loop in Bash Shell Scripting

What is Bash while loop? ... Generally speaking, the while loop is used to execute one or more commands (statements) until the given condition is True. As the ...

#42. How to use for/while/until loop in bash - Xmodulo

A while loop in bash consists of a conditional expression and a loop body which is surrounded by do and done . The loop body continues to be ...

#43. Bash 'While' Loop: Tutorial and Examples - All Things How

The while loop in Bash is used to execute command(s) (executed commands) multiple times based on the output of another command(s) (condition commands).

#44. Bash Scripting while loop examples - Landoflinux

While Loops. The Bash while loop is used to repeat a section of commands based on a condition. A while loop can also be an infinite loop. Below ...

#45. Looping Constructs (Bash Reference Manual) - GNU.org

The syntax of the while command is: ... The break and continue builtins (see Bourne Shell Builtins) may be used to control loop execution.

#46. Using Loops In Bash - Earthly Blog

The $count variable stores the number of guesses made by the user. A while loop is used to run the script as long as $count is less than or ...

#47. How to program with Bash: Loops - Opensource.com

I use the for loop quite often but I also find the while and until loops useful. for loops. Bash's implementation of the for command is, in my ...

#48. Loops and working with Files and Folders - Effective Shell

csv file into the read command in the while loop. The read command will read the file, line by line, until it finds the final line. This script has some issues:.

#49. For and While loop in Shell Scripts - OpenGenus IQ

To exit the loop manually, one must click ctrl+c to kill the process or ctrl+z to stop the process. Code: #!/bin/bash while : do echo "infinite loop"; done.

#50. Bash scripting: SSH breaks out of while-loop

If you use a bash shell script that does an ssh command within a while-loop, you may encounter that the ssh command will break out of the while-loop, ...

#51. Shell Scripting 101: While Loop in Shell Script

It can be as simple as waiting for a variable to become equal to a specified number, or as complex as waiting for the output for another command ...

#52. Bash while Loop: A Beginner's Guide - Career Karma

Bash while Loop ... While loops are sort of like a repeating conditional statement. They run a block of code only when a condition evaluates to ...

#53. shell script - while loop with multiple conditions

Programming This forum is for all programming questions. The question does not have to be directly related to Linux and any language is fair ...

#54. Unix Shell Loop Types: Do While Loop, For Loop, Until Loop ...

Overview of Unix Shell Loops and different Loop Types like Unix Do While Loop, Unix For Loop, Unix Until Loop. Learn these Unix loops with ...

#55. Why Looping Over find's Output Is a Bad Practice - Baeldung

An overview of issues with iterating over the find command's output. ... With this method, instead of using the Bash for loop or while loop, ...

#56. How to use a while loop in BASH to iterate over all cPanel ...

Introduction Making use of a BASH loop can greatly increase an administrator's efficiency when working with a large number of repetitive...

#57. bash: variable loses value at end of while read loop

This is best written (in Bash ≥ 3 and possibly even older) as while read; do let CNT++; done <input.data , which avoids the pipe, and thus ...

#58. Shell Programming - While Loop - Unix | Have fun learning :-)

To come out of the while loop we make the condition fail. To quit the script we can use the exit command. Example #1: Write a Shell Script to print from 1 to 5 ...

#59. Using For, While and Until Loops in Bash [Beginner's Guide]

Loops are essential for any scripting language. Learn for, while and until loops with examples in this chapter of Bash Beginner Series.

#60. Linux Bash While Loop Tutorial with Examples - POFTUT

The bash while loop has a simple syntax. We will define while and the condition and then we put code we want to execute in every iteration ...

#61. The while read loop - CCSF

This is exactly what happens in the cat command. This 'failure' status can be tested in a while statement like this: while read line; do.

#62. Bash Shell Scripting: Looping - Snipcademy

Learn how to write for, while, until loops on shell scripting for the Linux (bash). Also learn control flow techniques such as continue and break to direct ...

#63. linux - Bash: Increment variable inside while loop and display ...

Both... cnt=0 while [ $cnt -lt 10 ] do ((cnt++)) done echo $cnt ...and... cnt=0 while [ $cnt -lt 10 ] do let cnt=cnt+1 done echo $cnt.

#64. Advanced Bash Shell Scripting Guide - Loops - Linuxtopia

In contrast to a for loop, a while loop finds use in situations where the number of loop repetitions is not known beforehand. while [condition] do command.

#65. Bash while loop with Examples - TutorialsAndYou

Bash while loop ... while command executes a set of commands as long as the condition evaluates to a zero exit status. When the condition evaluates to non-zero ...

#66. Loops in bash

While read loops¶. A while loop is largely the same as a for loop. If you looked at the resources above, ...

#67. Bourne Shell Looping

while loop. The while construct is : while command do command ... done. Script, Output.

#68. Bash While loop explained - Candid.Technology

Bash while loop basics ... The basic syntax of the while loop is as follows. ... The loop will keep on repeating tasks one to three for as long as ...

#69. BASH scripting - WHILE loop variations - Variable scope

Hello dear Reader, Could you please help me understand why the variable COUNTER does not keep its value outside the while loop as seen in ...

#70. An Algorithm: How to Create Bash While Loop | DiskInternals

A While loop in a Bash script will trigger a series of commands to run repeatedly for as long as the condition result is “True.” Below is an ...

#71. 10-Bash Scripting - While loop & Until loop commands

WHILE loop command ... While loop allows us to define a command/condition & then it keeps the condition in loop until loop returns with a non-zero exit status.

#72. 3 Practical Examples of Using Bash While and Until Loops

0:19 – Using curl to get the HTTP status code of a response; 1:30 – Executing the curl command every 100ms in a while loop ...

#73. Bash While Loop: An Easy Way to Print Numbers from 1 to N

While loops are used in Bash scripting and in many other programming languages… Let's create a loop that goes through N numbers and prints only ...

#74. Caught In the Loop? Awk While, Do While, For Loop, Break ...

Linux Awk For, While Loop Examples This article is part of the on-going Awk Tutorial Examples series. In our earlier awk articles, ...

#75. 5 ways to run a loop with a number of times in Bash

Method 1: Brace expansion; Method 2: use seq command; Method 3: C-style for loop; Method 4: use while loop; Method 5: use until loop ...

#76. Looping 101 - While loop - Tcl/Tk

Like the if statement, they evaluate their test the same way that the expr does. In this lesson we discuss the while command, and in the next lesson, ...

#77. Create A Infinite Loop in Shell Script - TecAdmin

Bash Infinite While Loop ... In this scenario, which loop is the best option. The following syntax is used for create infinite while loop in a ...

#78. while loop | Linux# - Geek University

let NUM=$NUM+1 # let is a Bash and Korn shell built-in command for math. done. In the example above you can see that the while loop executes while the value of ...

#79. bash shell while loop无法break - SegmentFault 思否

while $(sleep 0.5); do pgrep -f baidu > /dev/null 2>&1 || (echo while00 && echo while01 && break); done.

#80. What is the Right Way to do Bash Loops? - Shell Tips!

In Bash, the loops are part of the control flow statements. There is three loop constructs available in bash: for-loop, while-loop, and until-loop. All the bash ...

#81. while and until (Learning the Korn Shell, 2nd Edition)

In while, the loop executes as long as the condition is true; in until, ... The meaning of this is essentially, "Do statements until command runs correctly.

#82. Bash Tutorial => Feed a while loop with the output of a ...

This feeds a while loop with the output of a grep command: while IFS=":" read -r user _ do # "$user" holds the username in /etc/passwd done < <(grep "hello" ...

#83. Array Loops in Bash - Stack Abuse

Array loops are so common in programming that you'll almost always need to ... Although the popular Bash shell is shipped with most of Linux ...

#84. Bash: Reading input from the console while looping over ...

If you are using the direct output of a command to feed a while loop in BASH, you may still want to take user input inside that loop.

#85. Variables, if statements and while loops in bash (Data Coding ...

In this article I will show you 3 data coding concepts: variables, if-then-else statements and while loops. It will be useful for bash, ...

#86. while loop in Linux Shell Script - Java samples

#Script to test while statement # # if [ $# -eq 0 ] then echo "Error - Number missing form command line argument" echo "Syntax : $0 number"

#87. How to timeout bash while loop in given seconds/minutes

Is there a way to make the while loop cycle and continuously print the echo using the sleep command with some other wizardry fed in to the loop ...

#88. while - perform a set of commands multiple times - fish shell

The exit status of the while loop is the exit status of the last iteration of the ... The -h or --help option displays help about using this command.

#89. Learn the concept of While Loop in Linux Shell Scripting

After talking about the for loop, it is time to discuss the second type of loops: the while loop. Unlike the for loop, the while loop ...

#90. Solved: Grep not functioning inside for/next or while loop...

echo statements work fine, but no result from the grep statement. While directly on the command line, works fine. $ HOSTSFILE="/home/hynesm/bin/ ...

#91. Bash Shell Scripting for beginners (Part 3) - Fedora Magazine

It will touch on functions, using comparisons with if/elif statements, and will wrap up with looking into the while loop.

#92. SQL WHILE loop with simple examples

If any SQL statement exists outside the loop, it will be executed. SQL WHILE loop syntax and example. The syntax of the WHILE loop in SQL looks ...

#93. while - JavaScript - MDN Web Docs - Mozilla

The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is ...

#94. C++ While Loop - W3Schools

C++ While Loop. The while loop loops through a block of code as long as a specified condition is true : Syntax.

#95. Bash script named arguments. If your script doesn't recognize ...

The scheduler allows you to fluently and expressively define your command schedule within your Laravel application itself. While loop is used to iterate ...

#96. Linux kernel coding style

This applies to all non-function statement blocks (if, switch, for, while, do). E.g.: ... Linux kernel style for use of spaces depends (mostly) on ...