Might also point out that the specifics are documented in this section of perlrun:

-m[-]module
-M[-]module
-M[-]'module ...'
-[mM][-]module=arg[,arg]...

-mmodule executes `use' module `();' before executing your program.

-Mmodule executes `use' module `;' before executing your program. You can use quotes to add extra code after the module name, e.g., `'-Mmodule qw(foo bar)''.

If the first character after the -M or -m is a dash (`-') then the 'use' is replaced with 'no'.

A little builtin syntactic sugar means you can also say -mmodule=foo,bar or -Mmodule=foo,bar as a shortcut for `'-Mmodule qw(foo bar)''. This avoids the need to use quotes when importing symbols. The actual code generated by -Mmodule=foo,bar is `use module split(/,/,q{foo,bar})'. Note that the `=' form removes the distinction between -m and -M.

-Blake

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