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use warnings;
use strict;
...
 0    18FEF200 X       8  45  01  00  00  00  00  FF  FF   17321.12260
+0 
 0    18FEF200 X       8  5A  02  00  00  00  00  FF  FF   17016.19730
+0
 0    18FEF200 X       8  75  02  00  00  00  00  FF  FF   17016.09727
+0

substr outside of string at parsefile.pl line 13, <DATA> line 12.
Use of uninitialized value $msgtype in string ne at parsefile.pl line 
+16, <DATA>
 line 12.