/usr/lib/ruby/vendor_ruby/active_support/core_ext/kernel/agnostics.rb is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | class Object
# Makes backticks behave (somewhat more) similarly on all platforms.
# On win32 `nonexistent_command` raises Errno::ENOENT; on Unix, the
# spawned shell prints a message to stderr and sets $?. We emulate
# Unix on the former but not the latter.
def `(command) #:nodoc:
super
rescue Errno::ENOENT => e
STDERR.puts "#$0: #{e}"
end
end
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