每 X 秒執行一次命令

我希望每 10 秒執行一次命令，並讓它在後台執行（從而消除watch？）。所有答案都顯示如下，但這將執行 11 到 14 秒。如何實現？

while true; do
   # perform command that takes between 1 and 4 seconds
   sleep 10
done

怎麼樣：

( # In a subshell, for isolation, protecting $!
 while true; do
   perform-command & # in the background
   sleep 10 ;
   ### If you want to wait for a perform-command
   ### that happens to run for more than ten seconds,
   ### uncomment the following line:
   # wait $! ;
   ### If you prefer to kill a perform-command
   ### that happens to run for more than ten seconds,
   ### uncomment the following line instead:
   # kill $! ;
   ### (If you prefer to ignore it, uncomment neither.)
 done
)

ETA：有了所有這些評論、替代方案和額外保護的子shell，這看起來比一開始要復雜得多。wait所以，為了比較，這是我開始擔心or之前的樣子kill，他們$!需要隔離：

while true; do perform-command & sleep 10 ; done

其餘的只是在您需要時使用。

引用自：https://unix.stackexchange.com/questions/235271