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    : '7th edition Bourne shell aka the V7 shell did not know # as com
+ment sign, yet.'
    : 'Workaround: the argument to the : null command can be considere
+d a comment,'
    : 'protect it, because the shell would have to parse it otherwise.
+'

sub shell_comment_quote {
    return '' unless @_;
...
    s/\n/\n#/g;
    return $_;
}

sub shell_quote {
    my ($rerr, $s) = _shell_quote_backend @_;
...
    }
    return $s;
}

 
sub shell_quote_best_effort {
    my ($rerr, $s) = _shell_quote_backend @_;
 
    return $s;
}

sub _shell_quote_backend {
    my @in = @_;
...
 
    return \@err, $ret;
}

sub _shell_quote_backend {
    my @in = @_;
...
    chop $ret;
    return \@err, $ret;
}

>bash --version
GNU bash, version 4.3.48(1)-release (x86_64-slackware-linux-gnu)
...
>! foo
-bash: foo: command not found
>

>bash --version
GNU bash, version 4.3.48(1)-release (x86_64-slackware-linux-gnu)
...
>! 'FOO=BAR' baz
-bash: FOO=BAR: command not found
>