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system() takes one parameter, not two or three or four.

You can't put quotes in quotes like that. If you must, escape them like \".

I repeat. By doing this "in perl", you are actually doing...

That's not even how you declare a variable in shell... I think you mean, how do you *-globbing in perl.

foreach( </sys/block/emcpow*> )
{
system("blockdev --setra 16384 $_");
}

Just...