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Shell Programming and Scripting

Match ids and print original file

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# 8  
Old 03-08-2013
Code:
$ awk ' NR == FNR && NR > 1 { arr[$2]=$3; next } FNR>1{ printf("%s",$0); if(arr[$2] == ""){ print " NULL"}else{print " "arr[$2]} } ' freq orig
chr1 879108 NULL
chr1 881918 0.007
chr1 896874 NULL

# 9  
Old 03-08-2013
Not sure that post#4 will satify the request. Try
Code:
$ awk   'FNR==NR        {a[$2] = $3; next}
                        {$0 = $0 FS (a[$2]?a[$2]:"NULL")}
         1
        ' file2 file1
Chr Position MAF
chr1 879108 NULL
chr1 881918 0.007
chr1 896874 NULL

If you don't need the "NULL" string, replace the conditional assignment with just a[$2].

Or, even shorter,
Code:
$ awk   'FNR==NR        {a[$2] = $3; next}
                        {print $0 FS (a[$2]?a[$2]:"NULL")}
        ' file2 file1

# 10  
Old 03-08-2013
Thank you very much. Both the above codes work fine.
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