从多个文件中提取数据列表

Question

我想就此寻求帮助。非常感谢！

我有数千个文件，每个文件包含 5 列，第一列包含名称。

$ cat file1   
name math eng hist sci    
Kyle 56 45 68 97    
Angela 88 86 59 30    
June 48 87 85 98

我还有一个包含可在 5 列文件中找到的姓名列表的文件。

$ cat list.txt    
June    
Isa    
Angela    
Manny

具体来说，我想以结构化的方式提取与我拥有的列表文件对应的第 3 列中的数据；代表数千个文件的列和作为行的名称。如果列表文件中的一个名称在 5 列文件中不存在，则应显示为 0。此外，列应以文件名开头。

$ cat output.txt    
names file1 file2 file3 file4    
June 87 65 67 87    
Isa 0 0 0 54    
Angela 86 75 78 78
Manny 39 46 0 38

Answer 1

$ cat awk-script
BEGIN{f_name="names"}       # save the "names" to var f_name
NR==FNR{
  a[]=;b[];next       # assign 2 array a & b, which keys is the content of "list.txt"
} 
FNR==1{                              # a new file is scanned
  f_name=f_name"\t"FILENAME;         # save the FILENAME to f_name
  for(i in a){                       
    a[i]=b[i]==""?a[i]:a[i]"\t"b[i]; # flush the value of b[i] to append to the value of a[i]
    b[i]=0                           # reset the value of b[i]
  } 
} 
{ if( in b){b[]=} }            # set  as the value of b[] if  existed in the keys of array b
END{
  print f_name;                      # print the f_name
  for(i in a){                       
    a[i]=b[i]==""?a[i]:a[i]"\t"b[i]; # flush the the value of b[i] to a[i] belongs to the last file
    print a[i]                       # print a[i]
  }
}

假设多了一个文件（即file1、file2等），可以使用命令获取结果，

$ awk -f awk-script list.txt file*
names   file1   file2
Manny   0       46
Isa     0       0
Angela  86      75
June    87      65

Answer 2

使用您的测试文件 list.txt 和 file1（两次）进行测试。首先是 awk:

$ cat program.awk
function isEmpty(arr, idx) {     # using @EdMorton's test for array emptiness
    for (idx in arr)             # for figuring out the first data file
        return 0                 # 
    return 1
}
function add(n,a) {              # appending grades for the chosen ones
    if(!isEmpty(a)) {            # if a is not empty
        for(i in n)              # iterate thru all chosen ones
            n[i]=n[i] (n[i]==""?"":OFS) (i in a?a[i]:0)  # and append
    }
}
FNR==1 {                         # for each new file 
    h=h (h==""?"":OFS) FILENAME  # build header
    process(n,a)                 # and process the previous file in hash a
}
NR==FNR {                        # chosen ones to hash n
    n[]
    next
}
 in n {                        # add chosen ones to a
    a[]=                     #
}
END {
    process(n,a)                 # in the end
    print h                      # print the header
    for(i in n)                  # and names with grades
        print i,n[i]
}

运行它：

$ awk -f program.awk list.txt file1 file1
list.txt file1 file1
Manny 0 0
Isa 0 0
Angela 86 86
June 87 87

从多个文件中提取数据列表

extract a list of data from multiple files

linux

awk

data-extraction