How can I check from Ruby whether a process with a certain pid is running?

Question

If there is more than one way, please list them. I only know of one, but I\'m wondering if there is a cleaner, in-Ruby way.

Answer 1

Under Linux you can obtain a lot of attributes of running programm using proc filesystem:

File.read("/proc/#{pid}/cmdline")
File.read("/proc/#{pid}/comm")