[root@www shell-script]# cat c_for02.sh#!/bin/bashfor((i=1,j=100;i<=10;i++,j--))doecho"i=$ij=$j"done 1. 2. 3. 4. 5. 6. for的无限循环 #!/bin/bashfor((i=0;i<1;i+=0))doecho"infinite loop"done 1. 2. 3. 4. 5. while循环 和for循环一样,while循环也是一种运...
fruit=orange; and on the third and final iteration,fruit=pear. Once it has completed the loop, the script continues normal execution with the next command after thedonestatement. In this case, it ends by saying “Let’s make a salad!” to show that it has ended the loop, but not the...
add.sh: 4: Syntax error: Bad for loop variable 代码没有错误,Ubuntu为了加快开机速度,用dash取代bash。 解决的方法:取消dash,使用bash: sudo dpkg-reconfigure dash 选择No选项。
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. ...
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在test命令中,bash shell会将额外的单词当作参数,进而造成错误。 也可以在for命令中列出多个目录通配符,将目录查找和列表合并进同一个for语句。 1$cattest72#!/bin/bash3# iterating through multiple directories4forfilein/home/rich/.b* /home/rich/badtest5do6if[ -d"$file"]7then8echo"$file is a ...
In this article,we gained insights into utilizing multiple variables within a shell scriptforloop. First, we explored the C-styleforloops, characterized by their resemblance to the syntax used in the C programming language. This method is for managing more intricate loop control structures. ...
For example, you can add the nested loop example to a Bash script to improve its readability, like this: $vimcopy_web_files.sh# !/bin/bashforiinfile{1..3};doforxinweb{0..3};doecho"Copying$ito server$x"scp$i$xdonedone When you save and execute this script, the result is the ...
bash -c ‘COMMAND’runsCOMMANDas a Bash shell script (we can also use the regularsh) > output.logsaves the command output to a log file &puts everything in the background Let’s runnohup, using ourforloop in the place ofCOMMAND: ...
for 语句的这种替代形式适用于 PowerShell 脚本文件和 PowerShell 命令提示符。 但是,在命令提示符处输入交互式命令时,使用带分号的 for 语句语法会更容易。 for 循环比 foreach 循环更灵活,因为它允许使用模式来递增数组或集合中的值。 在下例中,$i 变量在 语句的 Repeat 部分递增 2for。 PowerShell 复制 ...