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$ perl -le'use Config; print $Config{sh}'
/bin/sh

$ /bin/sh -c 'echo $SHELL'
/bin/bash

sub backticks_mysh {
  open(my $pipe, '-|', '/bin/mysh', '-c', $_[0])
...
  local $/ = wantarray ? $/ : undef;
  <$pipe>
}