I, too, must commend your efforts to post working code examples. Long may they multiply and be fruitful! (It would have been better, however, if most of the examples given had not simply repeated examples previously given by others. The one example that does not repeat a previous example in the thread does not seem to address any point previously raised in the thread.)

... these are Perl one-liners intended for the command-line, so $ characters are escaped for the shell ...

The examples you give appear to be for a *nix shell (bash?). Another way, and by far the most common for PerlMonks example code postings (or so it seems to me), is to use a non-interpolating shell quote character; see here and here for what seem to be *nix examples. Using non-interpolating quotation would seem to be a much simpler, hence preferable, way to present such Perl code.