Code before warnings are enabled at line 83, column 1.  See page 431 of PBP.  (Severity: 4)
Return value of "open" ignored at line 266, column 5.  Check the return value of "open" for success.  (Severity: 3)
Return value of "close" ignored at line 269, column 2.  Check the return value of "close" for success.  (Severity: 2)
Subroutine name is a homonym for builtin function delete at line 381, column 1.  See page 177 of PBP.  (Severity: 4)
Return value of "open" ignored at line 493, column 5.  Check the return value of "open" for success.  (Severity: 3)
Return value of "close" ignored at line 499, column 2.  Check the return value of "close" for success.  (Severity: 2)
Return value of "close" ignored at line 527, column 5.  Check the return value of "close" for success.  (Severity: 2)
Return value of "close" ignored at line 537, column 5.  Check the return value of "close" for success.  (Severity: 2)
Subroutine name is a homonym for builtin function next at line 725, column 1.  See page 177 of PBP.  (Severity: 4)
Mismatched operator at line 869, column 21.  Numeric/string operators and operands should match.  (Severity: 3)
Subroutine name is a homonym for builtin function seek at line 927, column 1.  See page 177 of PBP.  (Severity: 4)