FTDNA FF to PED Conversion

Posted by on June 23, 2012

Someone asked about how to convert a FTDNA Family Finder csv data file to the Plink format. I threw together a very simple Unix script to do that and I am sharing it here:

#!/bin/bash
if test -z "$1"
then
        echo "FTDNA raw data filename not supplied as argument."
        exit 0
fi
echo "Family ID: "
read fid
echo "Individual ID: "
read id
echo "Paternal ID: "
read pid
echo "Maternal ID: "
read mid
echo "Sex (m/f/u): "
read sexchr
if [[ $sexchr == m* ]]
then
        sex=1
elif [[ $sexchr == f* ]]
then
        sex=2
else
        sex=0
fi
pheno=0
 
echo "$fid $id $pid $mid $sex $pheno" > $id.tfam
 
dos2unix $1
sed '1d' $1 > $id.nocomment
awk -F, '{gsub(/"/,""); print $2,$1,"0",$3,substr($4,1,1),substr($4,2,1)}' $id.nocomment > $id.tped
rm $id.nocomment
 
plink --tfile $id --out $id --make-bed --missing-genotype - --output-missing-genotype 0

This script creates three files: *.bed, *.bim and *.fam, which are the binary format files for Plink. You can then use Plink to merge multiple files, filter SNPs or individuals and do other processing.

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