在Bash中每秒运行命令? [英] Run command every second in Bash?

问题描述

我想编写一些图像下载器，并在bash上分配它.我所拥有的和我所需要的:

I want to write some image downloader and assign it on bash. What I have and what I need:

我有:

1. 命令，效果很好(类似于wget http://mywebcam.com/image.jpg -O /var/cam/Image.jpg)

2. 根权限

1. Command, which works fine (something like wget http://mywebcam.com/image.jpg -O /var/cam/Image.jpg)

2. Root rights

服务器和网络摄像头之间的快速Internet线路

Fast Internet line between my server and my webcam

我需要什么:

每秒从相机下载图像*(睡眠1?)*并在本地对其进行重写(我的命令执行得很好)

Download image from camera every second*(sleep 1?)* and rewrite it localy (my command do it well) Run this script at once and don't worry about restart (I think I need to create file with bash commands and run it once + set crontab work "on reboot" to this file, right?)

也许有人知道我该怎么办?

Maybe there's someone who knows what should I to do?

推荐答案

如果要每隔一秒运行一次命令(一个命令的结束与下一个命令的开始之间相隔一秒，这与命令不同)每秒运行一次)，只需执行以下操作即可:

If you want to run a command at one second intervals (one second between the end of one command and the beginning of the next, which is not the same as running every second), just do:

while sleep 1; do cmd; done

如果您希望重启后开始，方法将取决于您的系统.

If you want that to start on reboot, the method will depend on your system.

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