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#!/usr/software/bin/perl

...
        |.*?is\snot\sa\svalid\soption.*/i
    );

#!/usr/software/bin/perl

...
    if ( $output
    =~ /The.*?command\stakes.*?arguments;\syou\sgave.*|Illegal\soption
+.*|.*?is\snot\sa\svalid\soption.*/i
    );