[英]How to add timestamp while redirecting stdout to file in Bash?
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.我有一个程序(服务器),我正在寻找一种方法(脚本),将其所有
stdout
重定向(或更好地复制)到文件并为每个条目添加时间戳。
I've done some research and the furthest I could get was thanks to How to add timestamp to STDERR redirection .我做了一些研究,我能得到的最远的结果是感谢How to add timestamp to STDERR redirection 。 It redirects
stdout
but the timestamp added is of the time when the script finishes:它重定向
stdout
但添加的时间戳是脚本完成的时间:
#!/bin/bash
./server | ./predate.sh > log.txt
code of predate.sh
: predate.sh
代码:
#!/bin/bash
while read line ; do
echo "$(date): ${line}"
done
It seems that server output is flushed after exit of the program.(without redirecting it works fine).似乎服务器输出在程序退出后被刷新。(没有重定向它工作正常)。 Also if I try using
predate.sh
on given example in mentioned thread, it works perfectly.此外,如果我尝试在提到的线程中的给定示例上使用
predate.sh
,它可以完美运行。 I am aware it would be easy adding a timestamp to the main program but I would rather avoid editing its code.我知道向主程序添加时间戳很容易,但我宁愿避免编辑其代码。
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.我最近正好需要: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,并在前面加上日期。
What I now use looks s.th.我现在使用的看起来很糟糕。 like this:
像这样:
picocom -b 115200 /dev/tty.usbserial-1a122C | awk '{ print strftime("%s: "), $0; fflush(); }' | tee serial.txt
picocom
is piped to awk
picocom
的输出通过管道传输到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) awk
在日期之前添加( %s
选项将时间转换为自 1970-01-01 00:00:00 UTC 以来的秒数- 或使用%c
为人类可读的格式)fflush()
flushes any buffered output in awk
fflush()
刷新awk
任何缓冲输出tee
which diverts it to a file.tee
,将其转移到一个文件中。 (you can find some stuff about tee
here ) tee
东西)moreutils ts
moreutils
ts
Absolute date and time is the default:绝对日期和时间是默认值:
$ sudo apt-get install moreutils
$ (echo a;sleep 1;echo b;sleep 3;echo c;sleep 2;echo d;sleep 1) | ts | tee myfile
$ cat myfile
Apr 13 03:10:44 a
Apr 13 03:10:45 b
Apr 13 03:10:48 c
Apr 13 03:10:50 d
or counting from program start with ts -s
:或从程序开始计数
ts -s
:
$ (echo a; sleep 1; echo b; sleep 3; echo c; sleep 2; echo d; sleep 1) | ts -s
00:00:00 a
00:00:01 b
00:00:04 c
00:00:06 d
or deltas for benchmarking with ts -i
:或使用
ts -i
进行基准测试的增量:
$ (echo a; sleep 1; echo b; sleep 3; echo c; sleep 2; echo d; sleep 1) | ts -i
00:00:00 a
00:00:01 b
00:00:03 c
00:00:02 d
$ (echo a; sleep 1; echo b; sleep 3; echo c; sleep 2; echo d; sleep 1) | ts -i '%.s'
0.000010 a
0.983308 b
3.001129 c
2.001120 d
See also: How to monitor for how much time each line of stdout was the last output line in Bash for benchmarking?另请参阅: 如何监视每行 stdout 是 Bash 中用于基准测试的最后输出行的时间?
Tested on Ubuntu 18.04, moreutils 0.60.在 Ubuntu 18.04、moreutils 0.60 上测试。
For Me Your Code is working perfectly fine对我而言,您的代码运行良好
Check this is what I tried检查这是我尝试过的
test.sh测试文件
#!/bin/bash
while true; do
echo "hello"
done
predate.sh早于.sh
#!/bin/bash
while read line; do
echo $(date) ":" $line;
done
then然后
./test.sh | ./predate.sh
gives me给我
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
Tue Jan 14 17:49:47 IST 2014 : hello
This can be redirected to some file using ">" or ">>" for append这可以使用“>”或“>>”进行附加重定向到某个文件
Again, using ts
from moreutils
, you can just use exec at the top of your script.同样,使用
moreutils
ts
,您只需在脚本顶部使用 exec 即可。
#!/bin/bash
exec > >(ts>>file.log)
echo hello 1
echo hello 2
sleep 5
echo hello 3
If I understand your problem is to have stderr output included in your log.txt file.如果我理解您的问题是在 log.txt 文件中包含 stderr 输出。 Right ?
对 ? If that's what you want the solution is:
如果那是您想要的解决方案是:
./server 2>&1 | ./服务器 2>&1 | ./predate.sh > log.txt
./predate.sh > log.txt
Regards问候
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