You may certainly assume, here at least, that “your knowledge of Perl scripting is very low” will never be interpreted as “dumb.” Enjoy...
Meanwhile ... “one-liners” are funky at times, but it works much better to put the thing into a .pl file. Because otherwise (as is the case here...) you run smack-dab into the preferences and the peculiarities of whatever shell you happen to be using, with regards to quote-marks and so forth. With the possible exception of Windows’ so-called “PowerShell,” Windows’s interpretation of what is a decent shell is virtually non-existent. ahem. Build a wtmp script that invokes the Perl code by referencing the Perl code in a file.
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