Assumptions: You can type a command at the command prompt
Ever wanted to simply find out who logged in when and what users you have on the system? Easy!!!
You can type:
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lastlogin
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It will give you a detailed list of users and when/if they ever logged in. Want to filter the list? Easy!!!
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lastlogin | grep (name of user)
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The command grep, as you know (or don't know) is an amazing command for filtering information displayed on a screen. You simply pipe out the information from lastlogin into grep and grep will filter the content based on that user. For example, if you have the user Fred, type this:
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lastlogin | grep fred
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That's it. No quotes or special characters required!
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