How can a Ruby class detect the process name that runs it?

Question

I am using delayed_jobs to run Ruby classes, how can the Ruby detect the name (command) of the process that is running it?

any thoughts?

Rosemaria

Answer 1

You can determine the name of the file using $0. You can even set the process name using it like so $0 = 'foo'Dave Thomas's blog post. If you want to get the command line args, you want to look at ARGV.

Plast

By the way, the $0 variable is aliased by $PROGRAM_NAME – Kennethkennett

Nice. That's a lot less confusing a name. – Plast

Answer 2

$0 Contains the name of the script being executed. (May be assignable so it can go wrong)

Hydroplane

ruby-prof's --replace-progname switch manipulates $0 for this very purpose, so the $0 == __FILE__ magic incantation in the script being run still works. – Aestivate

Answer 3

If you are are using Unix system you can execute script from ruby to determine process like this:

`ps aux | grep ruby` 

and then use $? to get the process

Gimble

This will show every ruby process on the system, not just the script in question. – Rattlepate