I have a doubt in usage of while loop in Shell script as Iam new to this. My requirement is that,I have two different directories containing some files which move files to other folder after parsing is done. In my script i wanted to add a while loop which checks for the count in the...
3、/etc/rc.d/rc3.d目录下分别有多个以K开头和以S开头的文件;分别读取每个文件,以K开头的输出为文件加stop,以S开头的输出为文件名加start,如K34filename stop S66filename start for files in /etc/rc.d/rc3.d/[KS]* ;do if [ `basename $files|cut -c1` == "K" ] ;then echo "$files stop...
用于重复执行一系列命令。在Shell中，主要有三种循环控制语句：for循环，while循环，和until循环。
ThewhileLoop Syntax Awhileloop inbashconsists of a conditional expression and a loop body which is surrounded bydoanddone. The loop body continues to be executed as long as the condition evaluates to true. The conditional expression inwhileloop can be surrounded by either a pair of single squa...
. In loop constructs, the single statement, or multiple statements enclosed in curly brackets, is known as the body of the loop. If the condition is true, the body of the loop is executed; if the condition is false, awk continues with the awk program. The syntax for a while loop is:...
The syntax is simple as shown below: while true; do echo "Running <command> at $(date)"; <command>; sleep <interval in sec> ; done Explanation of the above shell script The true keyword turns the while loop into an infinite loop sincethe exit statusor condition to be checked by the...
百度试题 题目下列语句不能在shell脚本中实现循环控制的是 A.loopB.forC.whileD.until相关知识点: 试题来源: 解析 A 反馈 收藏
您可以使用@来计算算术表达式，例如@ x = 2 + 2将$x设置为4;把它作为练习。将算术表达式括在反...
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 ...
While running bash scripts, you'll come across times when you want to run tasks repeatedly such as printing the value of a variable in a specific pattern multiple times. In this tutorial, I'm going to walk you through the following: The syntax of the while loop Multiple examples of the ...