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open( SANCLI, "datapath query essmap |" ) or die "unable to open pipe.
+.. $!";
$_ = <SANCLI>;  # read first line, do nothing with it
while(<SANCLI>) {
    ...

open( SANCLI, "datapath query essmap |" ) or die "unable to open pipe.
+.. $!";
$_ = <SANCLI>;
...
    @fields{@col_headings} = split;
    ...
}