Looking at $SHELL isn't necessarily a reliable way to
determine what shell variant is being used. As strace shows,
Perl is doing an execve("/bin/sh", ["sh", "-c", "echo $SHELL"] ... (at
least on Linux), and that's essentially all it can do... Other than
that, it's the shell's job to behave like a classic bourne shell when being
called as /bin/sh (which bash actually claims to do...).
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