Who is currently logged in?
who: lists all users currently in the system.
last: list login/logout history
lastb: list all the bad / failed login attempts
lastlog: show the last time somebody logged into the system
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Step 1, New a project rails new demo Step 2, Update Gemfile add paperclip, mysql2 gem, enable JavaScript runtime gem 'mysql2' ...
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error message: Fatal error: Call to undefined function imageantialias() in /var/www/vhosts/bar.php on line 13 The function imageantialia...
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