File merging based on column patterns


 
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# 1  
Old 10-27-2015
File merging based on column patterns

Hello Smilie

I am in this situation:

Input: two tab-delimited files, `File1` and `File2`. `File2` (`$2`) has to be parsed by patterns found in `File1` (`$1`).

Expected output: tab-delimited file, `File3`. `File3` has to contain the same rows as `File2`, plus the corresponding value in `File1` if the pattern is matched (end of the line, tab-separated).

File1 (tab-delimited) :

Code:
 
    ABC1    1    3    4
    ABC2    4    3    3
    ABC3    3    2    3
    ABC4    3    3    3

File2 (tab-delimited):
Code:
    text1   ABC1AB   text2   text3
    text2   ABC2AB   text1   
    text3   ABC1CDE   text2
    text4   ABC5AB   text3   text4

File3 (desired output, tab-delimited):

Code:
    text1   ABC1AB   text2   text3    1    3    4
    text2   ABC2AB   text1    4    3    3
    text3   ABC1CDE   text2    1    3    4
    text4   ABC5AB   text3   text4

I know this should be quite an easy task, could be done by awk/grep, but I didn't succeed to get it work :/

Any help is welcome, thanks in advance
# 2  
Old 10-27-2015
Please post your attempt(s) so we can analyse and/or improve in case.
# 3  
Old 10-27-2015
here's my (failed) attempt
Code:
$ awk -F"\t" 'FNR==NR{a[$1]=$2"\t"$3"\t"$4} FNR!=NR{$0=$0"\t"a[$3];print}' file1 file2 > file3

# 4  
Old 10-27-2015
Well, try
Code:
awk '
FNR==NR         {X=$1
                 sub ($1 FS, "")
                 T[X]=$0
                 next
                }
                {for (t in T) if ($2 ~ t) $(NF+1)=T[t]}
1
' FS="\t" OFS="\t" file1 file2
text1   ABC1AB  text2   text3   1       3       4
text2   ABC2AB  text1           4       3       3
text3   ABC1CDE text2   1       3       4
text4   ABC5AB  text3   text4

This User Gave Thanks to RudiC For This Post:
# 5  
Old 10-27-2015
Thank you so much, it works now Smilie Awesome!
# 6  
Old 10-27-2015
If the pattern is always 4 characters then you can replace the loop
Code:
 {for (t in T) if ($2 ~ t) $(NF+1)=T[t]}
1

by the efficient
Code:
 {print $0, T[substr($2,1,4)]}


Last edited by MadeInGermany; 10-27-2015 at 06:52 PM.. Reason: added a comma
This User Gave Thanks to MadeInGermany For This Post:
 
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