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#!/usr/bin/perl -l ... print $sha1->hexdigest; system 'sha1sum', $fname;
$ ./840698.pl foo e242ed3bffccdf271b7fbaf34ed72d089537b42f e242ed3bffccdf271b7fbaf34ed72d089537b42f e242ed3bffccdf271b7fbaf34ed72d089537b42f e242ed3bffccdf271b7fbaf34ed72d089537b42f foo