One of the many scripting constructs is the loop. A loop is a section of code that picks up data or generates data and then performs some operation on the data and then begins the process over again until some condition is met, the script is disrupted, or when input data is exhausted. ...
The script to printWelcome to Bash Scripting5 times using the while loop is as follows: #!/bin/bash i=1 while [ $i -le 5 ] do echo "Welcome to Bash Scripting" i=$(( $i+1 )) done Bash while Loop in One Line It is always a good practice to use fewer lines of code. The w...
所谓的 loop 就是 script 中的一段在一定条件下反复执行的代码。 bash shell 中常用的 loop 有如下三种: * for * while * until for loop 是从一个清单列表中读进变量值,并"依次"的循环执行 do 到 done 之间的命令行。 例: for var in one two three four five do echo --- echo '$var is '$v...
Bash While loop example 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 example of Bash While loop syntax. Example: Explicit example:
,p Q 现在对有问题的文件运行它。 ed -s file.txt < script.ed 从脚本中删除,p,以使stdout的输出静音,或者如果您对输出满意的话。 如果需要in-place编辑,请从脚本中将Q更改为w。 应该给出与bash解决方案大致相同的结果,但是由于仍然不知道在第233行和第238行应该发生什么,所以该行以#EXTVLCOPT开头...
最后要介绍的是shellscript 设计中常见的"循环"(loop)。所谓的 loop 就是 script中的一段在一定条件下反复执行的代码。 bashshell中常用的 loop 有如下三种: * for *while* until for loop 是从一个清单列表中读进变量值,并"依次"的循环执行 do 到 done 之间的命令行。 例: for v ...
Here is a sample shell code to calculate factorial using while loop: #!/bin/bashcounter=$1factorial=1while[$counter-gt0]dofactorial=$(($factorial*$counter))counter=$(($counter-1))doneecho$factorial To run just type: $ chmod +x script.sh ...
$ bash script.sh Enter the number of iterations: L Error: Input must be a positive integer. If the user inputiterations_countis valid, the script continues execution. 4. Conclusion In this article, we explored how to integrate user input into awhileloop condition. ...
在停止while循环在输出中重复的问题上,可以采取以下几种方法: 1. 使用break语句:在while循环内部设置一个条件,当满足该条件时,使用break语句跳出循环。这样可以确保循环在满足条件后...
问Bash脚本: While循环和if语句ENPython 编程中 while 语句用于循环执行程序，即在某条件下，循环执行某...