Slightly simplified, I think: 

use strict;
use warnings;

for (@ARGV) {
    if (-e) {
        &doTheWork($_);
    } else {
        warn qq{"$_" doesn't exist!};
    }
}

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In reply to Re^2: how to deal with incorrect command line argument by marinersk
in thread how to deal with incorrect command line argument by scripter87

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