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...
Bash While Loop examples when DiskInternals can help you Are you ready? Let's read! Bash scripting is a bit technical, but over time, as you keep writing scripts, they become easier and easier. Nevertheless, you have a couple of questions to ask in regards to the Bash While loop, right?
read 命令从标准输入读取行,所以 while 循环读取标准输入,直到 EOF 发生。 until循环 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 expressiondocommands #bodyofthe loop done 在...
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 while的条件部分也可以是执行一个命令。 $whileecho'ECHO';...
The bash loop constructs include the for loop, while loop, and until loop. 👉 Sometimes, you may find references to a select loop in bash. It is not part of the bash loop constructs. You can read more about the select-loop in my post How To Create Simple Menu with the Shell ...
bash脚本:while循环 while CONDITION; do statement ...done例如: 1.写一个脚本,输入任何字符,小写转换为大写。输入quit退出。 #!/bin/bashread -p "Input Something" STRING while [ $STRING != 'quit' ]; do echo $STRING|tr 'a-z' 'A-Z ' read -p "Inpu ...
until 语句在语法和功能上与 while 语句非常相似。两者之间唯一真正的区别是,当条件表达式为假时,直到语句执行其代码块,而当条件表达式为真时,while 语句执行其代码块。 syntax: until expression do commands #body of the loop done 在上面的 bash until 语法中: ...
Bash更改while循环中的变量值 bash variables while-loop command 我需要检查不同服务器中的一些值,并认为创建一个脚本来为我执行此操作,而不是多次运行同一个命令,这将是一个好主意。 为了检查值,我使用以下命令: qa qaServerName1 ps -ef | grep someName 我需要对该命令检索的所有行执行一些处理。如果我...
if [[ "${reverse}" == "${inputword}" ]] ; then 我们比较inputword和reverse是否相同,如果相同,则我们处理的是回文。 exit 0; 一旦我们有了一个成功的回文,我们就退出(exitcode0表示没有错误)。 程序(特别是while-loop)一直重复,直到找到成功的回文。本...
while : do echo "endless loop" done 等价于 #!/bin/bash while true do echo "endless loop" done 可以在 if/then 中作占位符: #!/bin/bash condition=5 if [ $condition -gt 0 ] #gt表示greater than,也就是大于,同样有-lt(小于),-eq(等于) ...