Use of uninitialized value in string comparison (cmp) at ./<script name> line 156.
 at ./<script name> line 156.
Use of uninitialized value in string comparison (cmp) at ./<script name> line 156.
 at ./<script name>l line 156.
Use of uninitialized value in string comparison (cmp) at ./<script name> line 156.
 at ./<script name> line 156.
....