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I'm not sure I understand your problem completely, but:

Try rosnode list to see if it's listed there, and then perhaps rosnode kill to get rid of it.

When you say you tried to find it using grep what do you mean? Do you mean you tried to find the running process? Or do you mean you tried to find the executable on disk? Something else?

I'm not sure I understand your problem completely, but:

Try 'rosnode list ' to see if it's listed there, and then perhaps 'rosnode kill ' to get rid of it.

When you say you tried to find it using grep what do you mean? Do you mean you tried to find the running process? Or do you mean you tried to find the executable on disk? Something else?