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If you could explain the flow and how/why we can create a module to run with -Mm it will be helpful
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The most commonly used special variable is $_, which contains the default input and pattern-searching string. For example, in the following lines − #!/usr/bin/perl foreach ('hickory','dickory','doc') { print $_; print "\n"; }
The syntax of the switch statement is:statement(s); break; case constant 2: statement(s);
-Mfoo simply generates the code use foo; and places it at the beginning of the code to be compiled.
-mfoo generates use foo ();
-Mfoo=bar,baz generates use foo ('bar','baz'); and so does -mfoo=bar,baz -- that is, there stops being a difference between -M and -m when you use the form with an equal sign, but without it, -m generates the "non-import" form of use.
This is all documented in perlrun.
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