awk 多个 csv 文件跳过标题答案

【问题标题】：awk multiple csv file skip headersawk 多个 csv 文件跳过标题
【发布时间】：2017-08-17 12:38:11
【问题描述】：

我正在使用 awk 连接多个 csv 文件并修改行但我不想打印标题我正在用另一种方法处理标题我只想让 awk 跳过标题

这是我的代码

OutFileName="Final.csv"                       # Fix the output name
i=0                                       # Reset a counter
for filename in ./*.csv; do 
 if [ "$filename"  != "$OutFileName" ] ;      # Avoid recursion 
 then 
   if [[ $i -eq 0 ]] ; then 
      head -1  $filename >   $OutFileName # Copy header if it is the first file
   fi
   text=$(echo $filename | cut -d '_' -f 2-) #spilliting the string to get the date 
   text=$(echo $text | cut -d '.' -f -1)
   awk -F',' -v txt="$text" 'FNR>1||$0=txt" "$1 FS $0' OFS=',' $filename | cat >> $OutFileName # cocatinating with awk 
   i=$(( $i + 1 )) #increse number
 fi
done

它会给出这样的输出

Trialtime   type    Track   time    Notes   Athlete 
Trialtime   type    Track   time    Notes   Athlete 
20170101 07:15:00   07:15:00    Warmup  ABC 85.2    Initial warmup  Jon
20170101 07:45:00   07:45:00    Sprint1 ABC 59.44   First Sprint    Jon
20170101 08:30:00   08:30:00    TRIAL   ABC 57.21   Final attempt   Jon
20170101 08:00:00   08:00:00    Warmup  ABC 120.51  Initial warmup  Bill
20170101 08:40:05   08:40:05    Sprint1 ABC 61.35   First Sprint    Bill
20170101 09:15:00   09:15:00    Sprint2 ABC 60.08   Second Sprint   Bill
20170101 10:30:00   10:30:00    TRIAL   ABC 60.37   Final attempt   Bill
20170101 07:15:00   07:15:00    Warmup  ABC 85.2    Initial warmup  Jon
20170101 07:45:00   07:45:00    Sprint1 ABC 59.44   First Sprint    Jon
20170101 08:30:00   08:30:00    TRIAL   ABC 57.21   Final attempt   Jon
20170101 08:00:00   08:00:00    Warmup  ABC 120.51  Initial warmup  Bill
20170101 08:40:05   08:40:05    Sprint1 ABC 61.35   First Sprint    Bill
20170101 09:15:00   09:15:00    Sprint2 ABC 60.08   Second Sprint   Bill
20170101 10:30:00   10:30:00    TRIAL   ABC 60.37   Final attempt   Bill
Trialtime   type    Track   time    Notes   Athlete 
201701023 07:15:00  07:15:00    Warmup  ABC 85.2    Initial warmup  Jon
201701023 07:45:00  07:45:00    Sprint1 ABC 59.44   First Sprint    Jon
201701023 08:30:00  08:30:00    TRIAL   ABC 57.21   Final attempt   Jon
201701023 08:00:00  08:00:00    Warmup  ABC 120.51  Initial warmup  Bill
201701023 08:40:05  08:40:05    Sprint1 ABC 61.35   First Sprint    Bill
201701023 09:15:00  09:15:00    Sprint2 ABC 60.08   Second Sprint   Bill
201701023 10:30:00  10:30:00    TRIAL   ABC 60.37   Final attempt   Bill
201701023 07:15:00  07:15:00    Warmup  ABC 85.2    Initial warmup  Jon
201701023 07:45:00  07:45:00    Sprint1 ABC 59.44   First Sprint    Jon
201701023 08:30:00  08:30:00    TRIAL   ABC 57.21   Final attempt   Jon
201701023 08:00:00  08:00:00    Warmup  ABC 120.51  Initial warmup  Bill
201701023 08:40:05  08:40:05    Sprint1 ABC 61.35   First Sprint    Bill
201701023 09:15:00  09:15:00    Sprint2 ABC 60.08   Second Sprint   Bill
201701023 10:30:00  10:30:00    TRIAL   ABC 60.37   Final attempt   Bill

你可以看到 awk 每次都为每个 csv 文件获取标题有没有办法忽略标题？

【问题讨论】：

标签： bash csv awk

【解决方案1】：

将|| 更改为{} 并使用显式打印

awk -F',' -v txt="$text" 'FNR>1 { print txt" "$1 FS $0 }'

【讨论】：

【解决方案2】：

在您的代码中，只需添加NR!=1 &&:

OutFileName="Final.csv"                       # Fix the output name
i=0                                       # Reset a counter
for filename in ./*.csv; do 
 if [ "$filename"  != "$OutFileName" ] ;      # Avoid recursion 
 then 
   if [[ $i -eq 0 ]] ; then 
      head -1  $filename >   $OutFileName # Copy header if it is the first file
   fi
   text=$(echo $filename | cut -d '_' -f 2-) #spilliting the string to get the date 
   text=$(echo $text | cut -d '.' -f -1)
   awk -F',' -v txt="$text" 'FNR>1||NR!=1 && $0=txt" "$1 FS $0' OFS=',' $filename | cat >> $OutFileName # cocatinating with awk 
   i=$(( $i + 1 )) #increse number
 fi
done

这将跳过第一行。

【讨论】：