leftjoin.pl
$queryFile = $ARGV[0];
$queryJoinFieldNum = $ARGV[1] - 1;
$dbFile = $ARGV[2];
$dbJoinFieldNum = $ARGV[3] - 1;
%dict = ();
open RH, $dbFile or die "Could not open $dbFile\n";
while(<RH>){
chomp;
$ln = $_;
@fields = split(/\t/, $ln);
$dbid = $fields[$dbJoinFieldNum];
$dict{$dbid} = $ln;
}
close RH;
open RH, $queryFile or die "Could not open $queryFile\n";
while(<RH>){
chomp ;
$ln = $_;
@fields = split(/\t/, $ln);
$qid = $fields[$queryJoinFieldNum];
print $ln . "\t" . $dict{$qid}. "\n";
}
close RH;