You will get this warning when you are doing interpolation of a variable into a double quoted string as well as with explicit concatenation e.g: 

use strict;
use warnings;
                                                                      
+          
my $foo;
                                                                      
+          
print "hshsh $foo ";

[download]
Also bear in mind that the line number is likely not to be correct where you have a here document.

/J\

In reply to Re: Do not undertand this error message by gellyfish
in thread Do not undertand this error message by b310

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