the for loop will be executed a total of 5 times, once for each item in the list. The current item from the list will be stored in a variable “varname” each time through the loop. This “varname” can
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 #!/bin/bash # List of values for item in apple banana cherry do echo "...
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...
使用break退出循环：fori in{1..10}doif[$i-eq5]thenbreakfiecho"Number:$i"done 使用continue跳过...
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!!!" ...
[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.
Shell编程中循环命令用于特定条件下决定某些语句重复执行的控制方式,有三种常用的循环语句:for、while和until。while循环和for循环属于“当型循环”,而until属于“直到型循环”。循环控制符:break和continue控制流程转向。 参考:《Linux 与unix shell 编程指南》 ...
via the command line. Converting this loop structure into a Bash script is also trivial. In this article, we show you some examples of how aforloop can make you look like a command line hero, and then we take some of those examples and put them inside a more structured Bash script. ...
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 ...
breakexits from afor,select,while, oruntilloop in a shell script. Ifnumberis given,breakexits from the given number of enclosing loops. The default value ofnumberis1. Usage Notes This is a special built-in command of the shell. Exit Values ...