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I ran the command service --status-all and it returned a list of what appear to be running services however what does each of the symbols +, -, ? mean. I had a look at the man pages but there is nothing that specifies what they mean. Attached is a screenshot.

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up vote 5 down vote accepted

[ + ] started
[ - ] stopped
[ ? ] unknown

Source: This post of this thread.

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Thanks however what does unkwown refer to and why does it have the state of unkwown? –  PeanutsMonkey Mar 13 '12 at 18:00
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According to the linked thread, services --status-all only knows the status of services started with "The old System-V style init way", while sudo initctl list will list those started with the "upstart" method. Testing shows, on Kubuntu, that there are some unknowns that don't appear on the sudo initctl list. Most do. I don't know any further than that. –  Bob Mar 15 '12 at 5:21
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