Shell literal 
-MB';$'F=shift

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produces the arg 
-MB;$F=shift

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You're probably familiar with -M. It used to load a module. It does so by inserting 
use MODULENAME;

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into the source. In this case, MODULENAME is B;$F=shift, so 
use B;$F=shift;

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is inserted into the source. B is a core module. It's not being used at all by the program. The only purpose to load it is to execute $F=shift; before the -n loop with very few keystrokes. The following would also work; it's just not nearly as short: 
'-MData::Dumper; $F=shift'

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In reply to Re^3: Feed ARGV into one-liner by ikegami
in thread Feed ARGV into one-liner by Saved

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