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my $file;
open(FILE, "<", $file) or die "error opening $file: stopped";
# ...work with FILE

The die() method is considered deprecated, as it prints the file name and line number in which it was invoked. This might be sensitive information.

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use Carp;

my $file;
open(FILE, "<", $file) or croak "error opening $file: stopped";
# ... work with FILE

Unlike, die(), croak() provides the filename and line number of the function that invoked the function that invoked croak(). This is more useful for application code that invokes library code; in this case croak() and carp() also will reveal the file name and line number of the application code rather than the library code.

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