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use strict;
use warnings;
...
    print $_ . "\n" && next if /no_proc/; #no processing
    print "$_ : in proc \n";              #processing
}

    print ($_ . "\n") && next if /no_proc/;

print (...) interpreted as function at ...

    if (/no_proc/){
        print $_ . "\n";
        next;
    }