From 188e64dde7746219802c1eafb9ef48df31f65f0d Mon Sep 17 00:00:00 2001
From: Nicolas R <atoomic@cpan.org>
Date: Tue, 16 Jun 2020 11:05:17 -0600
Subject: Provide a better recommendation for 'Run only under a shell'

Using an unset variable hides the true intent and
also requires an extra backslash `\$running_under_some_shell`
when used in heredoc.

Note that this could also lead to mistake when using
`\$` in a regular Perl program, as this would be true
and not false as it should be.

Stop recommending the use of an undefined variable for
the shell fallback. Use '0', with a comment
making clear the goal of 'if 0'.
---
 README.bs2000 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'README.bs2000')

diff --git a/README.bs2000 b/README.bs2000
index bfed5d5e48..d34cc7ce03 100644
--- a/README.bs2000
+++ b/README.bs2000
@@ -137,7 +137,7 @@ instead:
 
 : # use perl
     eval 'exec /usr/local/bin/perl -S $0 ${1+"$@"}'
-        if $running_under_some_shell;
+        if 0; # ^ Run only under a shell
 
 =head2 Using Perl in "native" BS2000
 
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