while循环在条件为真时重复执行一组命令。其基本结构如下：while test_commanddo other_commandsdone 例如，以下是一个使用while循环的示例，它会打印出数字10到1：#while loop testvar1=10while [ $var1 -gt 5 ]do echo $var1 var1=$((var1 - 1))done 在这个例子中，只要循环条件为真，就会持续...
while [ condition ]; do commands done 如果你考虑前一个例子,它可以使用while循环进行重写: #!/bin/bash num=1 while [ $num -le 10 ]; do echo $num num=$(($num+1)) done 如你所见,你首先需要将变量num定义为 1,然后在循环体内,你增加num的值。只要num小于或等于 10,while 循环就会检查条件并...
while : do echo "This is another infinite loop." sleep 1 done 在这两个例子中,true和:命令总是返回状态码0(表示成功),因此循环会无限进行下去。 说明如何安全地中断bash中的无限循环: 要安全地中断Bash中的无限循环,可以使用Ctrl+C组合键。这将发送一个中断信号给正在运行的脚本或命令,强制其停止执行。
Bash Infinite while Loop The infinite loops are used for many purposes in Bash scripting, such as testing, debugging, event handling, and managing background processes. The while loop stands as one of the crucial loop structures, often employed to construct infinite loops. The syntax of the whi...
#!/bin/bash while true do if [ `date +%H` -ge 17 ]; then break # exit loop fi echo keep running ~/bin/process_data done … run other commands here … 总结 永远循环很容易。指定要停止循环的条件却需要花费一些额外的精力。via: networkworld.com/articl ...
A While loop in a Bash script will trigger a series of commands to run repeatedly for as long as the condition result is “True.” Below is an example of Bash While loop syntax. Example: Explicit example: One-line While loop example: ...
while[$num-le10];do echo$num num=$(($num+1)) done 如你所见,你首先需要将变量num定义为 1,然后在循环体内,你增加num的值。只要num小于或等于 10,while 循环就会检查条件并运行脚本。 因此,现在运行脚本将会显示出和之前for循环中看到的完全相同的结果。
until 语句在语法和功能上与 while 语句非常相似。两者之间唯一真正的区别是,当条件表达式为假时,直到语句执行其代码块,而当条件表达式为真时,while 语句执行其代码块。 syntax: until expression do commands #body of the loop done 在上面的 bash until 语法中: ...
关键字do可以跟while不在同一行,这时两者之间不需要使用分号分隔。 whiletruedoecho'Hi, while looping ...';done 上面的例子会无限循环,可以按下 Ctrl + c 停止。 while循环写成一行,也是可以的。 $whiletrue;doecho'Hi, while looping ...';done ...
How to do a do-while loop in bash? How to create an infinite loop in bash? How to find if a number is odd or even in bash? How to iterate over a bash array? How to loop over each line of a file? How to iterate over a list of files? How to use numbers with leading zeros...