检查rsync命令是否成功运行 [英] Check if rsync command ran successful
问题描述
以下bash脚本每小时执行一次文件夹的rsync:
The following bash-script is doing a rsync of a folder every hour:
#!/bin/bash
rsync -r -z -c /home/pi/queue root@server.mine.com:/home/foobar
rm -rf rm /home/pi/queue/*
echo "Done"
但是我发现我的Pi断开了与互联网的连接，因此rsync失败了.因此，它执行了以下命令，删除了该文件夹.如何确定rsync命令是否成功(如果成功)，则可能会删除该文件夹.
But I found out that my Pi disconnected from the internet, so the rsync failed. So it did the following command, deleting the folder. How to determine if a rsync-command was successful, if it was, then it may remove the folder.
推荐答案
通常，任何Unix命令如果成功运行，都应返回0，在其他情况下，则应返回非0.
Usually, any Unix command shall return 0 if it ran successfully, and non-0 in other cases.
在man rsync中查找可能与您的情况相关的退出代码，但是我会这样:
Look at man rsync for exit codes that may be relevant to your situation, but I'd do that this way :
#!/bin/bash
rsync -r -z -c /home/pi/queue root@server.mine.com:/home/foobar && rm -rf rm /home/pi/queue/* && echo "Done"
只有一切正常，这将rm和echo完成.
Which will rm and echo done only if everything went fine.
其他方法可以使用$?变量，该变量始终是上一个命令的返回代码:
Other way to do it would be by using $? variable which is always the return code of the previous command :
#!/bin/bash
rsync -r -z -c /home/pi/queue root@server.mine.com:/home/foobar
if [ "$?" -eq "0" ]
then
rm -rf rm /home/pi/queue/*
echo "Done"
else
echo "Error while running rsync"
fi
请参见 man rsync ，第退出值
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