One of the many scripting constructs is the loop. A loop is a section of code that picks up data or generates data and then performs some operation on the data and then begins the process over again until some condition is met, the script is disrupted, or when input data is exhausted. ...
WHILE loop - read line of a file one by one, I'm using a "while" loop within a shell script (BASH) to read line of a file (one by one) -- "Fortunately", its not working the No. of times the file has lines in it. Here's the summary: $ cat inputfile.txt Utilizing For L...
In the following example, I am giving thescript.shas the file name to read. Bash while Loop Count Number of Lines in a File Counting several lines in a file is another practical usage of the while loop in Bash. The following script counts the number of lines of a file and displays th...
In Linux,whileloopsare essential tools for automating repetitive tasks and controlling the flow of programs.These loops enable us to execute a block of code repeatedly, provided that a specified condition is true. Moreover,whileloops are versatile in that we can include user input as the specifie...
[me@linuxbox~]$while-count12345Finished. The syntax of thewhilecommand is: while 命令的语法是: whilecommands;docommands;done Likeif,whileevaluates the exit status of a list of commands. As long as the exit statusis zero, it performs the commands inside the loop. In the script above, the...
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
如何在Linux中从shell脚本调用另一个shell脚本 通常在Linux上,您可以使用crontab来执行此类调度任务。但是,您必须指定“设置计时器”的时间,因此,如果您希望在文件本身中配置计时器,则必须为此创建一些机制。 例如,您可以添加crontab 30 1 * * 5 /path/to/script/script.sh 将在每周五凌晨1:30执行脚本: 30分钟 ...
Example 1: Infinite While loop in a shell script An infinite While loop means your script will run the loop commands non-stop. Infinite While loops never stop running and this occurs when the condition always turns out to be “True.” ...
Let’s make the script executable and run it: $ chmod +x IFS.sh $ ./IFS.sh John 20 Doe 30 Bob 40 David 50 In this script, we see that theIFSis set to the colon:character. Next, theforloop iterates over each line in thedata.txtfile. Each line is then assigned to thenvariable...
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