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.” ...
Shell scripting, specifically Bash scripting, is a great way to automate repetitive or tedious tasks on your systems. Why type when you can schedule and run scripts in a hands-free manner? One of the many scripting constructs is the loop. A loop is a section of code that picks up data ...
The loop structure is one of the key components of every programming language including Bash. They are used to repeat the specified instructions against a condition. Frequently employed loop structures in Bash scripting arefor,while, anddo-while. In Bash scripting, thewhileloop functions by repeatin...
In this example, the break statement will skip the while loop when user enters -1, otherwise it will keep adding two numbers: #!/bin/bashwhile:doread-p"Enter two numnbers ( - 1 to quit ) : "a bif[$a-eq-1]thenbreakfians=$((a + b))echo$ansdone Earlycontinuation with the conti...
/bin/bash x=1 while [ $x -le 5 ] do echo "Welcome $x times" x=$(( $x + 1 )) done 1. 2. 3. 4. 5. 6. 7. Here is a sample shell code to calculate factorial using while loop: #!/bin/bash counter=$1 factorial=1...
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
shell脚本forloops&whileloops题解 一、for loops for 变量名 in 列表;do 循环体 done 执行机制: 依次将列表中的元素赋值给“变量名”; 每次赋值后即执行一次循环体; 直 到列表中的元素耗尽,循环结束 列表生成方式: (1) 直接给出列表 (2) 整数列表:...
echo "Loop completed." Let’s discuss the instructions in thescript.shfile: #!/bin/bash– this line is known as theshebang, and its purpose is to instruct the system to execute this script using the Bash shell read -p “Number of iterations: ” iterations_count– thereadcommand prompts...
Shell while 循环while 循环用于不断执行一系列命令,也用于从输入文件中读取数据;命令通常为测试条件。其格式为:while command do Statement(s) to be executed if command is true done命令执行完毕,控制返回循环顶部,从头开始直至测试条件为假。以下是一个基本的 while 循环,测试条件是:如果 COUNTER 小于5,那么...
In this version of the script, we set up an endless loop (one that never terminates on itsown) by using the true command to supply an exit status to while. Since true willalways exit with a exit status of zero, the loop will never end. This is a surprisinglycommon scripting technique...