是否有一个Unix实用程序prePEND时间戳标准输入？
我结束了在Python写一个快速的小脚本，但我想知道是否有一个实用工具，您可以养活文字到这将prePEND有一些文本每行 - 在我的特定情况下，时间戳。理想的情况下，使用会是这样的：
I ended up writing a quick little script for this in Python, but I was wondering if there was a utility you could feed text into which would prepend each line with some text -- in my specific case, a timestamp. Ideally, the use would be something like:
cat somefile.txt | prepend-timestamp
（你回答SED之前，我想这样的：
(Before you answer sed, I tried this:
cat somefile.txt | sed "s/^/`date`/"
不过，只有一次评估时，sed的执行，所以同样的时间戳错误prepended于各行的日期命令）。
But that only evaluates the date command once when sed is executed, so the same timestamp is incorrectly prepended to each line.)
可以尝试使用 AWK ：
<command> | awk '{ print strftime("%Y-%m-%d %H:%M:%S"), $0; fflush(); }'
您可能需要确保＆LT;指挥GT; 生产线缓冲的输出，即，它在每行后刷新其输出流;时间戳 AWK 增加将是该行的末尾出现在它的输入管的时间。
You may need to make sure that <command> produces line buffered output, i.e. it flushes its output stream after each line; the timestamp awk adds will be the time that the end of the line appeared on its input pipe.
如果AWK显示错误，然后尝试 GAWK 代替。
If awk shows errors, then try gawk instead.