Linux (17) View several commands for user login history

1.last, the default read is the/var/log/wtmp file content, showing the user login history and System restart history

-N #: Displays information about recent # times

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2.LASTB, the default is to read the contents of the/var/log/btmp file, showing the user's wrong way of landing

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3.lastlog: Displays the last successful login information for each user;

-U USERNAME: Displays recent login information for a specific user

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4.who Show users who are logged in

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Test if a user is online if who | grep username&>/dev/null;then

echo "Online"

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Linux (17) View several commands for user login history