awk仅适用于复制的数据，为什么? [英] awk only works on copied data, why?
问题描述
我有一个稍微简单的awk，用于此处描述的目的:
I have a somewhat straightforward awk used for the purpose described here:
Append multiple header information fields to file until next header found
awk仅在将数据复制/粘贴到新文件中后才可使用.例如，如果我将head的输出定向到一个新文件中，则awk仍然无法正常工作.仅当我将文件复制/粘贴到新文件时，awk才起作用.
The awk only works on the data after I copy/paste it into a new file. If I direct the output of head into a new file, the awk still does not work, for instance. The awk only works if I copy/paste the file into a new file.
`head -40 file.csv > output.csv`
这是awk:
`awk -F, '/"Serial No."/ {sn = $2}
/"Location:"/ {loc = $2}
/"([0-9]{1,2}\/){2}[0-9]{4} [0-9]{2}:[0-9]{2}"/
{$0 = loc FS sn FS $0}1' file.csv>master1.csv`
如果我复制/粘贴数据并将其与原始数据进行比较，则输出表明每一行都有差异，但没有说明在哪里.如果您看一下主要输出与复制/粘贴文件之间的区别，则会得到:
If I copy/paste the data and compare it to the original data, the output indicates a difference in every single line, but does not say where. If you look at a diff between a head output and a copy/paste files you get:
`diff trap4_top.csv trap4_again.csv'
:
< 1,25c1,24
< "Serial No.","0700000036022821"
< "Location:","LS_trap_2c"
< "High temperature limit (�C)",20
< "Low temperature limit (�C)",0
< "Date - Time","Temperature (�C)"
< "5/28/2015 08:00",24.0
< "5/28/2015 10:00",29.5
< "5/28/2015 12:00",28.0
< "5/28/2015 14:00",28.5
< "5/28/2015 16:00",27.0
< "5/28/2015 18:00",24.5
< "5/28/2015 20:00",23.0
< "5/28/2015 22:00",22.5
< "5/29/2015 00:00",21.5
< "5/29/2015 02:00",21.0
< "5/29/2015 04:00",20.0
< "5/29/2015 06:00",20.0
< "5/29/2015 08:00",24.5
< "5/29/2015 10:00",26.0
< "5/29/2015 12:00",27.5
< "5/29/2015 14:00",30.0
< "5/29/2015 16:00",29.0
< "5/29/2015 18:00",25.5
< "5/29/2015 20:00",23.5
< "5/29/2015 22:00",23.0
---
> "Serial No.","0700000036022821"
> "Location:","LS_trap_2c"
> "High temperature limit (°C)",20
> "Low temperature limit (°C)",0
> "Date - Time","Temperature (°C)"
> "5/28/2015 08:00",24.0
> "5/28/2015 10:00",29.5
> "5/28/2015 12:00",28.0
> "5/28/2015 14:00",28.5
> "5/28/2015 16:00",27.0
> "5/28/2015 18:00",24.5
> "5/28/2015 20:00",23.0
> "5/28/2015 22:00",22.5
> "5/29/2015 00:00",21.5
> "5/29/2015 02:00",21.0
> "5/29/2015 04:00",20.0
> "5/29/2015 06:00",20.0
> "5/29/2015 08:00",24.5
> "5/29/2015 10:00",26.0
> "5/29/2015 12:00",27.5
> "5/29/2015 14:00",30.0
> "5/29/2015 16:00",29.0
> "5/29/2015 18:00",25.5
> "5/29/2015 20:00",23.5`
我在diff中看到特殊字符，但是到目前为止，除了复制/粘贴以外，我是否参与其中，或者删除它们的确切方式不是.
I see special characters in the diff but I'm not if they're involved, or how exactly to remove them, other than copy/paste so far.
head trap4.csv | cat -vte
给予:
"Serial No.","0700000036022821"^M$
"Location:","LS_trap_2c"^M$
"High temperature limit (M-0C)",20^M$
"Low temperature limit (M-0C)",0^M$
"Date - Time","Temperature (M-0C)"^M$
"5/28/2015 08:00",24.0^M$
"5/28/2015 10:00",29.5^M$
"5/28/2015 12:00",28.0^M$
"5/28/2015 14:00",28.5^M$
"5/28/2015 16:00",27.0^M$
推荐答案
好的，我怀疑您的输入文件具有DOS行尾，即\r或^M(如上所示).
Alright so as I suspected your input file has DOS line endings i.e. \r or ^M (as shown above).
您应该通过运行以下命令将输入文件转换为unix行结尾:
You should convert your input file to unix line endings by running:
dos2unix file.csv
否则，您可以执行以下操作:
Otherwise you can do:
head -40 file.csv | sed 's/\r//' | awk ...
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