You can have awhileloop to keep checking for that directory's existence and only write a message while the directory does not exist. If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhil...
text pulled from a file, the output of another Bash command, or parameters passed via the command line. Converting this loop structure into a Bash script is also trivial. In this article, we show you some examples of how aforloop can make you look like...
add.sh: 4: Syntax error: Bad for loop variable 代码没有错误,Ubuntu为了加快开机速度,用dash取代bash。 解决的方法:取消dash,使用bash: sudo dpkg-reconfigure dash 选择No选项。
#!/bin/bash while true do if [ `date +%H` -ge 17 ]; then exit # exit script fi echo keep running ~/bin/process_data # do some work done 如果要退出循环而不是退出脚本,请使用 break 命令而不是 exit。 #!/bin/bash while true do if [ `date +%H` -ge 17 ]; then break # exit...
利用直接执行的方式来执行 script 直接指令下达 (不论是绝对路径/相对路径还是 ${PATH} 内),或者是利用bash (或 sh) 来下达脚本时,该 script 都会使用一个新的 bash 环境来执行脚本内的指令。 也就是说,使用这种执行方式时, 其实 script 是在子程序的 bash 内执行。 需要注意的是:重点在于:『当子程序完成...
Linux Bash Script loop shell 编程之流程控制 for 循环、while 循环和 until 循环 for var in item1 item2 ... itemN do command1 command2 ... commandN done 1. 2. 3. 4. 5. 6. 7. for var in item1 item2 ... itemN; do command1; command2… done; ...
如何在Linux的bash中永远循环 在Linux 中有很多永远循环(或直到你决定停止)的方法,你可以在命令行或脚本中执行此操作。 在Linux 中有很多永远循环(或直到你决定停止)的方法,你可以在命令行或脚本中执行此操作。 for和while命令使这件事非常容易。关于相应的语法和策略,只有几件事要牢记。
[root@www shell-script]# cat c_for02.sh#!/bin/bashfor((i=1,j=100;i<=10;i++,j--))doecho"i=$ij=$j"done 1. 2. 3. 4. 5. 6. for的无限循环 #!/bin/bashfor((i=0;i<1;i+=0))doecho"infinite loop"done 1. 2.
fruit=orange; and on the third and final iteration,fruit=pear. Once it has completed the loop, the script continues normal execution with the next command after thedonestatement. In this case, it ends by saying “Let’s make a salad!” to show that it has ended the loop, but not the...
/bin/bash #A function to return an echo statement. helloFunc() { echo "Hello from a function." } #invoke the first function helloFunc() helloFunc 你会看到如下输出结果: [zexcon@fedora ~]$ ./learnToScript.sh Hello from a function....