如何将stdout重定向到Bash中的文件时添加时间戳? [英] How to add timestamp while redirecting stdout to file in Bash?

问题描述

我有一个程序(服务器)，我正在寻找一种方法(脚本)将所有stdout重定向(或更好地复制)到文件中，并为每个条目添加时间戳.

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.

我已经进行了一些研究，而我能得到的最深入的感谢是如何为STDERR重定向添加时间戳.它重定向stdout，但是添加的时间戳记是脚本完成的时间:

I've done some research and the furthest I could get was thanks to How to add timestamp to STDERR redirection. It redirects stdout but the timestamp added is of the time when the script finishes:

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

predate.sh的代码:

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

似乎在程序退出后刷新服务器输出.(不进行重定向也可以正常工作).另外，如果我尝试在提到的线程中的给定示例上使用predate.sh，则它可以完美运行.我知道在主程序中添加时间戳会很容易，但是我宁愿避免编辑其代码.

It seems that 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 works perfectly. I am aware it would be easy adding a timestamp to the main program but I would rather avoid editing its code.

推荐答案

我最近确实需要:在串行控制台(picocom)中接收日志消息，将它们打印到终端和文件中，并在日期前加上

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.

我现在使用的东西看起来是…….像这样:

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的输出通过管道传输到awk
• awk加上日期(%s选项将时间转换为自1970-01-01 00:00:00 UTC以来的秒数-或将%c用作可读格式)
• fflush() 刷新awk中的所有缓冲输出 通过管道传递到tee的
• 会将其转移到文件中. (您可以找到有关tee
  • 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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