Starting processing of file, test1.txt.
Line 1 from 'test1.txt'
Line 2 from 'test1.txt'
Line 3 from 'test1.txt'
Use of uninitialized value in concatenation (.) or string at ./test.pl line 13, <TEST_FILE> line 3.
Ending processing of file, .
Starting processing of file, test2.txt.
Line 1 from 'test2.txt'
Line 2 from 'test2.txt'
Line 3 from 'test2.txt'
Use of uninitialized value in concatenation (.) or string at ./test.pl line 13, <TEST_FILE> line 6.
Ending processing of file, .