awk的不同的文件的相同列到同一新的文件

问题描述

我有多个文件夹案例1，案例2 ....案例-N
他们有一个名为PPD文件，我想提取所有的第2列，并把它们放到123.dat命名一个文件。
看来我不能用awk循环。

I have multiple folders Case-1, Case-2....Case-Nthey have a file named PPD, I want to extract all 2nd column and put them into one file named 123.dat. It seems that I cannot use awk in for loop.

case=$1
for (( i = 1; i <= $case ; i ++ ))
do
    file=Case-$i
    cp $file/PPD temp$i.dat

    awk 'FNR==1{f++}{a[f,FNR]=$2}
         END
         {for(x=1;x<=FNR;x++)
             {for(y=1;y<ARGC;y++)
             printf("%s ",a[y,x]);print ""} }'  

    temp$i.dat >> 123.dat   
done

现在123.dat只有最后PPD的案例-N日

Now 123.dat only has the date of the last PPD in Case-N

我知道我可以使用连接（我以前使用的命令），如果每一个PPD文件至少有一列是相同的，但事实证明是极其缓慢的，如果我有很多案例的文件夹

I know I can use join(I used that command before) if every PPD file has at least one column the same, but it turns out to be extremely slow if I have lots of Case folders

推荐答案

下面 AWK 程序可以帮助你。

#!/usr/bin/awk -f

BEGIN {
    # Defaults
    nrecord=1
    nfiles=0
}

BEGINFILE {
    # Check if the input file is accessible,
    # if not skip the file and print error.
    if (ERRNO != "") {
        print("Error: ",FILENAME, ERRNO)
        nextfile
    }
}

{
    # Check if the file is accessed for the first time
    # if so then increment nfiles. This is to keep count of
    # number of files processed.
    if ( FNR == 1 ) {
        nfiles++
    } else if (FNR > nrecord) {
        # Fetching the maximum size of the record processed so far.
        nrecord=FNR
    }

    # Fetch the second column from the file.
    array[nfiles,FNR]=$2

}

END {
    # Iterate through the array and print the records.
    for (i=1; i<=nrecord; i++) {
        for (j=1; j<=nfiles; j++) {
            printf("%5s", array[j,i])
        }
        print ""
    }
}

输出：

$ ./get.awk Case-*/PPD
    1   11   21
    2   12   22
    3   13   23
    4   14   24
    5   15   25
    6   16   26
    7   17   27
    8   18   28
    9   19   29
   10   20   30

下面的案例* / PPD 扩展到案例-1 / PPD ，案例-2 / PPD ，案例-3 / PPD 等。下面是为其生成的输出的源文件。

Here the Case*/PPD expands to Case-1/PPD, Case-2/PPD, Case-3/PPD and so on. Below are the source files for which the output was generated.

$ cat Case-1/PPD 
1   1   1   1
2   2   2   2
3   3   3   3
4   4   4   4
5   5   5   5
6   6   6   6
7   7   7   7
8   8   8   8
9   9   9   9
10  10  10  10
$ cat Case-2/PPD 
11  11  11  11
12  12  12  12
13  13  13  13
14  14  14  14
15  15  15  15
16  16  16  16
17  17  17  17
18  18  18  18
19  19  19  19
20  20  20  20
$ cat Case-3/PPD 
21  21  21  21
22  22  22  22
23  23  23  23
24  24  24  24
25  25  25  25
26  26  26  26
27  27  27  27
28  28  28  28
29  29  29  29
30  30  30  30

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