How to compare the lines in two files in the columns ID? - linux

Question

I have two files with dynamic length from 1 to 30 lines, and these data:
[File1]
Time | Name | Name | ID1 | ID2
10:50 | Volume | Xxx | 55 | 65
12:50 | Kate | Uh | 35 | 62
15:50 | Maria | Zzz | 38 | 67
15:50 | Alex | Web | 38 | 5
...
[File2]
Time | Name | Name | ID1 | ID2
10:50 | Les | Xxx | 31 | 75
15:50 | Alex | Web | 38 | 5
...
How to compare two files [only ID1 and ID2 columns]: [File1] and [File2] to all first lines of the file {File1] compared with all lines of {File2].
If data exists in both files saved to a file [File3] data adding character *
In addition to the file {File3] have hit other data from [File1].
Result:
[File3]
Time | Name | Name | ID1 | ID2
15:50 | Alex | Web | * 38 | 5
10:50 | Volume | Xxx | 55 | 65
12:50 | Kate | Uh | 35 | 62
15:50 | Maria | Zzz | 38 | 67

Answer 1

Using awk
awk 'BEGIN{t="Time | Name | Name | ID1 | ID2"}
FNR==1{next}
NR==FNR{a[$4 FS $5];next}
{ if ($4 FS $5 in a)
{$4="*"$4;t=t RS $0}
else{s=s==""?$0:s RS $0}
}
END{print t RS s}' FS=\| OFS=\| file2 file1
Time | Name | Name | ID1 | ID2
15:50 | Alex | Web |* 38 | 5
10:50 | Volume | Xxx | 55 | 65
12:50 | Kate | Uh | 35 | 62
15:50 | Maria | Zzz | 38 | 67
Explanation
BEGIN{t="Time | Name | Name | ID1 | ID2"} # set the title
FNR==1{next} # ignore the title, FNR is the current record number in the current file.for each file
NR==FNR{a[$4 FS $5];next} # record the $4 and $5 into Associative array a
{ if ($4 FS $5 in a)
{$4="*"$4;t=t RS $0} # if found in file1, mark the $4 with start "*" and attach to var t
else{s=s==""?$0:s RS $0} # if not found, attach to var s
{print t RS s} # print the result.