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I was wondering if there was a way to detect which users had an active ssh session, or rather how long they have been logged in.

Thanks!

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Out of curiosity, why do you want to track the time used? – Nick ODell Jun 14 '11 at 4:19
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migrated from stackoverflow.com Jun 15 '11 at 1:52

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use w and last.

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Each ssh session has a corresponding tty process. Just check how long it has been running.

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