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 Loopin Linux. Bash For Loop Syntax As mentioned earlier, thefor loopit...
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...
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,...
# Define loop to read argument values for myval in $* do # Print each argument echo "Argument: $myval" done The following output will appear after executing the above script. Two arguments have been given as command-line arguments here. These are ‘Linux’ and ‘Hint’. Example-4: ...
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 $file 变量用双引号圈起来。如果不这么做,遇到含有空格的目录名或文件名时就会有错误产生。 1./test6: line6: [: too many arguments2./test6: line9: [: too many arguments ...
Adding a for loop to a Bash script Runningforloops directly on the command line is great and saves you a considerable amount of time for some tasks. In addition, you can includeforloops as part of your Bash scripts for increased power, readability, and flexibility. ...
《Linux Command Line and Shell Scripting Bible》Part 13 更多的结构化命令(for while until) for命令 基本语法格式 for var in list do commands done 也可以写成 for var in list; do commands done 读取列表中的值 1 2 3 4 5 6 7 8 9
tail-n +$int1outputs all lines starting from line number$int1onwards $(…)performs command substitution, replacing the expression with the output of the enclosed commands To elaborate,for j in $(cat $ch | tail -n +$int1)sets up a loop wherejtakes on each value (word) in the output...
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...
But there’s a significant difference: the for loop executes thelsprogram 2 separate times, with a single filename passed to it each time. In the separate ls example, the glob pattern (*.xml) matches filenames first and then sends all of them, as individual command-line parameters, to ...