如何导出当前日期和时间并在包含"Hello"的每一行的末尾附加 [英] How to derive current date and time and append at the end of each line that contains 'Hello'

问题描述

我有以下文件party.txt，其中包含以下内容:

I have the following file party.txt that contains something like the following:

Hello Jacky
Hello Peter
Bye Johnson
Hello Willy
Bye Johnny
Hello Mary
Hello Wendy

我使用grep hello捕获内容，但是当我使用print date +"%Y-%m-%d'并将其追加到内容时，我将无法捕获，并且每行会得到很多0.

I used the grep hello to capture the contents, but when I use the print date +"%Y-%m-%d' and append to it, I cannot, and I will get many 0 per line.

cat party.txt | grep Hello | awk '{ print date +"%Y-%m-%d"}'

我可能会缺少什么?

推荐答案

使用awk的一种方法:

awk -v date="$(date +"%Y-%m-%d %r")" '/Hello/ { print $0, date}' party.txt

结果:

Hello Jacky 2012-09-11 07:55:51 PM
Hello Peter 2012-09-11 07:55:51 PM
Hello Willy 2012-09-11 07:55:51 PM
Hello Mary 2012-09-11 07:55:51 PM
Hello Wendy 2012-09-11 07:55:51 PM

请注意，日期值仅在awk开始时设置，因此即使命令运行很长时间也不会更改.

Note that the date value is only set when awk starts, so it will not change, even if the command takes a long time to run.

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