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#!/tool/bin/perl -w
use strict;
...
    printf("element $i of array = ");
    printf("%s\n", $array[$i]);
}

> ./stderr_test.pl
Use of uninitialized value in printf at ./stderr_test.pl line 11.
...
Use of uninitialized value in printf at ./stderr_test.pl line 11.
element 4 of array =
...

> ./stderr_test.pl > & log

Use of uninitialized value in printf at ./stderr_test.pl line 13.
Use of uninitialized value in printf at ./stderr_test.pl line 13.
...
element 1 of array = 
element 2 of array = 
...

open(STDERR,'>&', STDOUT);