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Bash：读行“或每 60 秒”

tag-icon • tag-icon bash read
Bash：读行“或每 60 秒”

如何实现以下示例中的“或每 60 秒”？

prints_output_in_random_intervals | \
while read line "or every 60s"
do
  do_something
done

答案1

内置 bash 文档help read提到：

-t timeout  time out and return failure if a complete line of input is
            not read withint TIMEOUT seconds.  The value of the TMOUT
            variable is the default timeout.  TIMEOUT may be a
            fractional number.  If TIMEOUT is 0, read returns success only
            if input is available on the specified file descriptor.  The
            exit status is greater than 128 if the timeout is exceeded

由于read如果由于达到超时而返回，则会失败，因此这种情况也会导致循环退出。如果你想避免这种情况，你可以忽略read的退出状态，如下所示：

while read -t 60 line || true; do
    ...
done

或者

while true; do
    read -t 60 line
    ...
done

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