In a shell script, aforloop allows you to iterate over a set of values or a range of numbers. Here are a few examples of how to useforloops in different contexts: Example 1: Iterating Over a List of Values AI检测代码解析 #!/bin/bash # List of values for item in apple banana che...
For example, you can run UNIX command or task 5 times or read and process list of files using a for loop. A for loop can be used at a shell prompt or within a shell script itself. for loop syntax Numeric ranges for syntax is as follows: for VARIABLE in 1 2 3 4 5 .. N do c...
One can use the for loop statement even within a shell script. While the For Loop is a prime statement in many programming languages, we will focus on how to use it for the bash language. Are you ready to add yet another tool to your developer arsenal? Let’s explore deeper into the...
如果会报错,没有则跳过: Syntax error: Bad for loop variable 原因:代码对于标准bash而言没有错,因为Ubuntu为了加快开机速度,用dash代替了传统的bash,是dash在捣鬼。 解决方法:取消dash dpkg-reconfigure dash 出现弹框,选择NO 参考原文详情,解决报错: http://blog.csdn.net/yf210yf/article/details/9206185 3、...
Bash shell script two variables in for loop, This might be another way to use two variables in the same loop. But you need to know the total number of files (or, the number of times you want to run the loop) in the directory to use it as the value of iteration i. Get the numbe...
If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhile[!-ddirectory_expected]doecho"`date`- Still waiting"sleep1doneecho"DIRECTORY IS THERE!!!" ...
Bash for Loop to Create a Conditional Exit With Break Loop In addition to the three-expression structure, usefor-into automatically stop the loop when the script operation meets a specific condition. Here’s the code syntax: for i in 1 2 3 4 5 do if [condition] then break fi statement...
PowerShell 复制 $i=1 for (;;$i++) { Write-Host $i } 此语句仍将无限期重复,直到你按 Ctrl+C 中断命令。 可使用一个条件来终止 for 循环。 可使用 语句的 Condition 部分放置条件for。 当条件的计算结果为 for 时,$false 循环会终止。 在下例中,for 循环将在 $i 的值小于或等于 10 时运行...
drwxr-xr-x 2 root root 42 6月 9 15:23log[root@mongodb10 shell]# 此时,又出现了一个新的 ShellCheck 提示: Use find instead of ls to better handle non-alphanumeric filenames. 详见Wiki SC2012 建议我们使用find命令来代替ls 用find 代替 ls ...
ForEach 建構會針對每個物件處理一次大括弧之間的 Windows PowerShell 命令。 處理命令時,$user 是包含陣列中每個項目的變數。 在第一個反覆項目上,$user 包含$users[0],而在第二個反覆項目上,$user 包含$user[1]。 這會繼續執行,直到陣列中的所有項目都已處理一次為止。 在指令碼中,ForEach...