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FreeBSD use the Network Time Protocol (NTP) for synchronising the clocks of computer systems over packet-switched, variable-latency data networks. NTP uses UDP port 123. If you have one computer or single server then you can easily synchronization time with other NTP servers. All you need is ntp client called ntpdate. It is use to set […]

This is especially useful for Linux/BSD/Unixish system which have multiple users with access to the console. One user may lock his or her session while still allowing other users to use the system on other virtual consoles. If desired, the entire console may be locked and virtual console switching disabled. This is really a good […]

You can use utility smbclient (part of samba server) to send a message to windows system from FreeBSD (or even from Linux/Solaris/UNIX OS). This command lets you send messages to windows workstations, display browse lists, and connect to SMB shares. Genral syntax of to send a message is as follows:
smbclient -M <WINDOW-SYSTEM-NAME> <<EOF
Message
Message
…
..
…
When the message […]

You can use the wall command to send a message to every user on a system. General syntax of wall command is as follows:
wall
Message
Message
…
….
..
When the message is complete, press Control-D.
1) To display message “Disk failure system will be down for 30 minute” to all users use wall as follows:
# wall
Disk failure system will be down […]

You can send a message to an individual FreeBSD user logged into system using the write command. Typically writing a short message to an Individual user is main usage.
1) Use write command as follows
$ write user-name
Your message
Your message
…
When the message is complete, press Control-D
2) Here is an example of a message:
$ write joy
Do not use […]

The process is extremely simple all you need to understand is configuration file modification. X Window System use TCP port 6000 to listen network connection. By default almost all operating system including FreeBSD turns off this feature for security reason. Because of this setting you are not allowed to remotely open a window. Let us […]