How do I see if my friends or coworkers are logged into the same Linux or BSD or UNIX (AIX, HP-UX, Apple OS X) server / workstation as I am from a command line?

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Q. I’ve Debian Linux server and whenever someone trying to ssh into this box, they get an error as follows and server closes the connection:

System bootup in progress -please wait

How do I fix this problem and allow ssh login?


How do I reboot my Linux based system? How do I reboot a remote Linux system or server using command line?


Q. How do I block access to root user over ssh session? A.. sshd (OpenSSH Daemon) is the daemon program for ssh. Server side ssh configuration is defined in /etc/ssh/sshd_config file. You need to use DenyUsers option to block access to root user. This option can be followed by a list of user name patterns, […]