我正在阅读 Ruby 的“man”页面，我看到以下“-S”标志的描述：
-S Makes Ruby use the PATH environment variable to search for script, unless its name begins with a slash. This is used to emulate #! on
machines that don't support it, in the following manner:
#! /usr/local/bin/ruby
# This line makes the next one a comment in Ruby \
exec /usr/local/bin/ruby -S $0 $*
On some systems $0 does not always contain the full pathname, so you need the -S switch to tell Ruby to search for …ruby ×1