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use strict;
system( "cp /analysis/fasta1.fa /analysis2/fasta1.fa" ) 
    or die print "Can't copy fasta file: $! \n";

use strict;
&doSystemCommand(  "cp /analysis/fasta1.fa /analysis2/fasta1.fa"  );
...
        die "Failed executing [$systemCommand]\n"; 
    }
}