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while (<IN>) {
   # print if /$pattern/; # normal "grep"
   print unless /$pattern/; # grep -v
}

print $_ unless $_ =~ /$pattern/;

perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>); 
+$rose = "smells sweet to degree $n"; *other_name = *rose; print "$oth
+er_name\n"'