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  1. or download this
    use strict;
    use warnings;
    ...
    29998
    29999
    30000
    
  2. or download this
    # first time
    the 8887 th line of test.txt is 8888
    ...
    fh> line 29884.
    Use of uninitialized value in pattern match (m//) at serarch_file.pl l
    +ine 42, <$
    fh> line 29884.