In this example, we look for the longest string found within a file. When given one ormore filenames on the command line, this program uses the strings program (which isincluded in the GNU binutils package) to generate a list of readable text “words” in eachfile. The for loop process...
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...
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
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,...
被嵌套的叫内部循环( Inner Loop ) 写一个简单的例子演示一下,如下图 image 13.6 循环处理文件数据 这个内容其实在上文中的13.1.5 更改字段分隔符小节中就有演示 这里写一个稍微复杂一点的升级版演示一下,如下图 在读取文件之前,将 IFS 的值改为了只识别换行符 ...
《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
jtag-loop.sunxi ARM native boot helper to force the SD port into JTAG and then stop, to ease debugging of bootloaders. sunxi-bootinfo Dump information from Allwinner boot files (boot0/boot1) --type=sd include SD boot info --type=nand include NAND boot info (not implemented) ...
Linux Shell 之 for 循环语句 1、for 命令 重复执行一系列命令在编程中很常见。通常你需要重复一组命令直至达到某个特定条件,比如处理某个目录下的所有文件、系统上的所有用户或是某个文本文件中的所有行。 bash shell提供了for命令,允许你创建一个遍历一系列值的循环。每次迭代都使用其中一个值来执行已定义好的...
/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循环也是一种运行前测试语句,语法更简单: whileexpressiondocommanddone 1. 2. 3. 4. 首先while将测试expression的返回值,如果返回值为真则执行循环体,返回值为假则不执行循环。循环完成后进入...
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