InBashscripting, there are 3 types ofloops:for loop,while loop, anduntil loop. The three are used to iterate over a list of values and perform a given set of commands. In this guide, we will focus on theBash For
The for command is useful on the command line. We can easily demonstrate how it works: 在命令行中 for 命令是很有用的。我们可以很容易的说明它是如何工作的: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [me@linuxbox ~]$ for i in A B C D; do echo $i; done A B C D In this...
Hopefully, these examples have demonstrated the power of aforloop at the Bash command line. You really can save a lot of time and perform tasks in a less error-prone way with loops. Just be careful. Your loops will do what you ask them to, even if you ask them to do something destr...
for ((i=1; i<=3; i++))do for ((j=1; j<=3; j++)) do echo "Outer loop: $i, Inner loop: $j" donedone```上述示例代码中,使用双括号(( ))定义了循环的初始条件、终止条件和迭代方式。外层循环执行3次,内层循环执行3次,输出了所有的组合。这些示例展示了for循环在Linux命令中的常见用法,...
Now that we know what our command is doing, let’s try to run it usingnohup. 3. RunforLoop Withnohup Let’s try to directly execute aforloop withnohup: $ nohup for i in /home/*; do echo "$i"; done > output.log & bash: syntax error near unexpected token `do' ...
Usage of * in the bash for loop is similar to the file globbing that we use in the linux command line when we use ls command (and other commands). For example, the following will display all the files and directories under your home directory. This is the concept that is used in the...
if a line may include spaces better use a while loop: # cat filelist.txt | while read LINE; do echo "${LINE}"; done 1. 2. 3. 4. 10 Bash for Loop In One Line Examples Bash For Loop Examples In Linux What Is Bash in Linux?
在Linux中,目录名和文件名中包含空格当然是合法的。要适应这种情况,应该将 $file 变量用双引号圈起来。如果不这么做,遇到含有空格的目录名或文件名时就会有错误产生。 1./test6: line6: [: too many arguments2./test6: line9: [: too many arguments ...
《Linux Command Line and Shell Scripting Bible》Part 13 更多的结构化命令(for while until) for命令 基本语法格式 for var in list do commands done 也可以写成 for var in list; do commands done 读取列表中的值 1 2 3 4 5 6 7 8 9
In Linux the time it takes to do the 20M loop starts at say 25 milliseconds. Then drops to 0 ms after the third or fourth iteration. Doing the same test on Windows all loops seem to take about the same time (25-30 ms) all the way through the 10 iterations. Why does the time ...