Shell scripting, specifically Bash scripting, is a great way to automate repetitive or tedious tasks on your systems. Why type when you can schedule and run scripts in a hands-free manner? One of the many scripting constructs is the loop. A loop is a section of code that picks up data ...
/bin/bashvar=5while[$var-ge 0 ]doechoout loop:$varfor((a=1;a<3;a++))do((result=var*a))echo"$var*$a=$result"donevar=$[$var-1]done #!/bin/bashIFS_OLD=$IFSIFS=$'\n'forentryin$(cat/etc/passwd)doecho"entry:$entry"IFS=:forvaluein$entrydoecho"$value"donedoneIFS=$IFS_OLD...
$ ./for-loop.sh 1 2 3 4 5 6 7 8 9 10 你也可以使用for num in 1 2 3 4 5 6 7 8 9 10; do,但是使用括号扩展使得代码看起来更短且更智能。 {..}是用于扩展模式的。你使用{d..h},它等同于d e f g h。关于括号扩展的更多信息,可以在这篇文章中找到。 在Bash 中使用括号扩展 如果你...
In Bash scripting, thewhileloop functions by repeating a set of instructions as long as the specified condition is true. Typically, the while loop is preferred where the number of iterations is uncertain or variable. In this guide, I will explore theBash while loop, its syntax, and usage th...
Not all shells support C-styleforloops, so using multiple variables in such loops may not be universally applicable across different shell environments. First, let’s consider a simple shellforloop: $ cat simple_for.sh #!/bin/bash echo "Simple for loop example:" ...
“`bash #!/bin/bash count=0 while [ $count -lt 5 ] do echo “Loop iteration: $count” count=$((count+1)) done “` 在这个例子中,我们使用count变量作为计数器,循环5次。每次循环,计数器加1,并打印循环次数。 ## 2. 读取文件中的每一行 ...
How to execute a one-line while loop in Bash? How do you structure a while loop? How do I Break a while loop in PowerShell? Crafting a one-line shell script using a while loop and if statement Solution 1: This should work:
51CTO博客已为您找到关于while循环 linux的相关内容,包含IT学习相关文档代码介绍、相关教程视频课程,以及while循环 linux问答内容。更多while循环 linux相关解答可以来51CTO博客参与分享和学习,帮助广大IT技术人实现成长和进步。
我使用过的Linux命令之while - Bash中的While循环 用途说明 while循环是Shell中常用的语法结构,它与其他编程语言中的while有些类似,只是写法有些不一样罢了。 常用格式 格式一 while 条件; do 语句 done 格式二 死循环 while true do 语句 done 格式三 死循环...
/bin/bash fornumin{1..10};do echo$num done 如果你运行它,你应该会看到像这样的输出: $./for-loop.sh 1 2 3 4 5 6 7 8 9 10 你也可以使用for num in 1 2 3 4 5 6 7 8 9 10; do,但是使用括号扩展使得代码看起来更短且更智能。