/usr/lib/ruby/vendor_ruby/specinfra/command/base/port.rb is in ruby-specinfra 2.35.1-1.
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 | class Specinfra::Command::Base::Port < Specinfra::Command::Base
class << self
def check_is_listening(port, options={})
pattern = ":#{port} "
pattern = " #{options[:local_address]}#{pattern}" if options[:local_address]
pattern = "^#{options[:protocol]} .*#{pattern}" if options[:protocol]
"netstat -tunl | grep -- #{escape(pattern)}"
end
end
end
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