How MRI Ruby's ARGV really works

gistfile1.txt

# The docs say that ARGV[0] should be the name of the Ruby executable.
# http://ruby-doc.org/core-2.2.3/Object.html#ARGV
#
# This is **NOT** how Ruby actually behaves:


─trevorrosen@Saramago ~
╰─$ cat argv-test.rb
#!/usr/bin/env ruby

p ARGV[0]




╭─trevorrosen@Saramago ~
╰─$ ruby argv-test.rb
nil
╭─trevorrosen@Saramago ~
╰─$ ruby argv-test.rb foo
"foo"
╭─trevorrosen@Saramago ~
╰─$ ./argv-test.rb
nil
╭─trevorrosen@Saramago ~
╰─$ ./argv-test.rb foo
"foo"