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$SIG{CHLD} = 'IGNORE'; 
defined (my $kid = fork) or die "Cannot fork: $!\n"; 
...
    my $run = "perl /webRoot/apps/startPipe.pl -f $dest_file -j $job_ 
++ID -c $created -t $job_type $adv_opts"; `$run`;
    CORE::exit(0); # terminate the process 
}

for my $i (1 .. 1) 
{ 
...
    $blast_output = `$blast_run`; 
    warn "Error: $!\n";
    ...

blastn ATH1_chr1.1con.01222004 /webRoot/cgi-bin/jobs/15-12-2007/WZuFQe
+ +miR8sSigXB3vFjLiuix/WZuFQemiR8sSigXB3vFjLiuix -warnings 

Error: No such file or directory