巴什 - 如何添加时间戳，而标准输出重定向到文件 [英] Bash - how to add timestamp while redirecting stdout to file

问题描述

我有一个程序（服务器）和我正在寻找一种方式（脚本）将重定向（或更好的副本）的所有标准输出到文件，并为每个条目添加时间戳。 I V做了一些研究和最远的我能得到多亏如何时间戳添加到STDERR重定向。它重定向标准输出，但增加的时间时间戳当脚本完成：

I have a program(server) and I am looking for a way(script) that will redirect(or better duplicate) all its stdout to file and add timestamp for each entry. I v done some research and furthest I could get was thanks to How to add timestamp to STDERR redirection. It redirects stdout but add timestamp of time when the script finished:

#!/bin/bash
./server | ./predate.sh > log.txt

predate.sh的code：

code of predate.sh:

#!/bin/bash
while read line ; do
    echo "$(date): ${line}"
done

我是初学Linux的，我显然失去了一些东西非常重要，因为它似乎在程序退出后，服务器输出被刷新。（没有重定向它工作正常）。另外，如果我尝试使用在提到线程给出的例子predate.sh，它完美地工作。我知道它会在probram可以轻松添加时间戳，但我宁愿避免编辑其code。

I am linux beginner and I am obviously missing something very important since it seems server output is flushed after exit of the program.(without redirecting it works fine). Also if i try using predate.sh on given example in mentioned thread, it work perfectly. I am aware it would be easy adding timestamp in the probram but i would rather avoid editing its code.

编辑：只工作答案在注释中。

the only working answers are in comments

推荐答案

我最近需要确切地指出：以串行控制台（picocom）接收日志消息，把它们打印到终端，到一个文件，prePEND日期

I recently needed exactly that: receive log messages in a serial console (picocom), print them to a terminal and to a file AND prepend the date.

我现在用看起来s.th.像这样的：

What I now use looks s.th. like this:

picocom -b 115200 /dev/tty.usbserial-1a122C | awk '{ print strftime("%s: "), $0; fflush(); }' | tee serial.txt

• picocom 通过管道输送到 AWK 输出


• AWK prepends的日期（％S 选项时转换为的号码几秒钟自1970-01-01 00:00:00 UTC 的 - 或使用％C 的可读格式）


• fflush（） 刷新任何缓冲输出 AWK


• 被输送到 T恤它转移到一个文件中。 （你可以找到关于一些东西发球 here)


• the output of picocom is piped to awk
• awk prepends the date (the %s option converts the time to the Number of seconds since 1970-01-01 00:00:00 UTC - or use %c for a human-readable format)
• fflush() flushes any buffered output in awk
• that is piped to tee which diverts it to a file. (you can find some stuff about tee here)

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