Comapring columns in 2 files and printing the values that differ

Question

I have a file (file-1) that looks like this,

DIP-10097N|refseq:NP_416170|uniprotkb:P30015
DIP-10117N|refseq:NP_414973|uniprotkb:P08177
DIP-10168N|refseq:NP_418766|uniprotkb:P15005
DIP-10199N|refseq:NP_415632|uniprotkb:P30958
DIP-10358N|refseq:NP_418659|uniprotkb:P28903
DIP-10440N|refseq:NP_289596|uniprotkb:P20082
DIP-10441N|refseq:NP_417502|uniprotkb:P20083
DIP-10441N|refseq:NP_417502|uniprotkb:P20083
DIP-10467N|refseq:NP_415423|uniprotkb:P09373
DIP-10469N|refseq:NP_418386|uniprotkb:P32674
DIP-10562N|refseq:NP_418370|uniprotkb:P17888
DIP-10582N|refseq:NP_414864|uniprotkb:P77743
DIP-10592N|refseq:NP_415819|uniprotkb:P37344

and another (file-2) which looks like this,

DIP-10331N|refseq:NP_311078|uniprotkb:P12638     DIP-10117N|refseq:NP_414973|uniprotkb:P08177
DIP-10331N|refseq:NP_311078|uniprotkb:P12638    DIP-10840N|refseq:NP_414640|uniprotkb:P10408
DIP-1025N|refseq:NP_414574|uniprotkb:P00968     DIP-10097N|refseq:NP_416170|uniprotkb:P30015
DIP-10467N|refseq:NP_415423|uniprotkb:P09373    DIP-10097N|refseq:NP_416170|uniprotkb:P30015
DIP-10117N|refseq:NP_414973|uniprotkb:P08177    DIP-10117N|refseq:NP_414973|uniprotkb:P08177
DIP-10117N|refseq:NP_414973|uniprotkb:P08177    DIP-10750N|refseq:NP_289799|uniprotkb:P02410
DIP-10117N|refseq:NP_414973|uniprotkb:P08177    DIP-10757N|refseq:NP_288150|uniprotkb:P02421

In output I want to print the contents of file-1 plus the value in either column of file-2 that has the same value as that of file-1 in the other column. Like this,

DIP-10097N|refseq:NP_416170|uniprotkb:P30015 DIP-1025N|refseq:NP_414574|uniprotkb:P00968
DIP-10097N|refseq:NP_416170|uniprotkb:P30015 DIP-10467N|refseq:NP_415423|uniprotkb:P09373
DIP-10117N|refseq:NP_414973|uniprotkb:P08177 DIP-10117N|refseq:NP_414973|uniprotkb:P08177
DIP-10117N|refseq:NP_414973|uniprotkb:P08177 DIP-10750N|refseq:NP_289799|uniprotkb:P02410
DIP-10117N|refseq:NP_414973|uniprotkb:P08177    DIP-10757N|refseq:NP_288150|uniprotkb:P02421
DIP-10117N|refseq:NP_414973|uniprotkb:P08177 DIP-10331N|refseq:NP_311078|uniprotkb:P12638
DIP-10467N|refseq:NP_415423|uniprotkb:P09373 DIP-10097N|refseq:NP_416170|uniprotkb:P30015

Is there a way I can do it using awk or grep. Any help would be highly appreciated.

Costas · Accepted Answer · 2015-11-02 09:33:26Z

3

This is wide known operation in awk — collect array from key-file then use the array to operate with second file values

awk '
    FNR==NR{
            A[$2] = A[$2] " " $1
            next
    }
    $1 in A{
            for(i=1;i<=split(A[$1], B);i++)
                print $1 B[i]
    }
    ' file2 file1

Or a little bit shorter:

awk '
    FNR==NR{
            A[$2] = A[$2] $2 " " $1 "\n"
            next
    }
    $1 in A{
            printf "%s", A[$1]
    }
    ' file2 file1

Other variant

grep -f <(cat -E file1) file2 |
sed 's/\(\S*\)\s*\(\S*\)/\2\t\1/' |
sort

At last easiest (as for me):

join -2 2 file1 <(sort -k2 file2)

edited Nov 2, 2015 at 9:33

answered Nov 2, 2015 at 8:54

Costas

15k24 silver badges38 bronze badges

Thanks. All of these work. Can you be so kind to explain the last code please.

Sumayya
– Sumayya

2015-11-02 10:47:29 +00:00
Commented Nov 2, 2015 at 10:47
To join files its should be sorted by join field. As we can see file1 is sorted already so we'l sort file2 by second field(-k2 option) only. Then we join two files by first field file1 (which have just 1) as default and file2 by second field(option -2 2). So output will be: field 1 from file1(which equal field 2 from file2) and residue — corespondent field 1 from file2

Costas
– Costas

2015-11-02 17:47:45 +00:00
Commented Nov 2, 2015 at 17:47

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