What is the significance of write and talk command in unix

The blocked user will not be notified that their messages have been blocked. You can also block or allow all messages with a mesg command like one of these:.

Another command for sending text without reverting to email is write. This command can be used to communicate with a specific user. It just sends the text. If the user is logged in on more than one terminal, you can specify which terminal you want to send the message to or you can rely on the system to choose the one with the shortest idle time. The talk or ytalk command gives you a chance to have an interactive chat with one or more other users.

The command will bring up a double-pane top and bottom window. Each individual will type into the top portion of the display on their screen and see the responses in the bottom section s. The respondents can respond to a talk request by typing "talk" followed by the username of the person addressing them. The window can involve more than two participants if ytalk is used. As you can see in the example below the result of the "talk dory" command shown above , talk is often ytalk.

Join Date: Jun Join Date: Oct The user you are trying to talk to has to have a terminal window open for talk to work. Try the following command: talk user hostname. How to use MAN to find information about read and write function? The command "man read" show some rubbish, for example "man open" show great information about function I need. Shell Programming and Scripting. Hi, I hope the title does not scare people to look into this thread but it describes roughly what I'm trying to do.

I need a solution in PHP. I'm a programming beginner, so it might be that the approach to solve this, might be easier to solve with an other approach of someone else, so if you Is it because other users on the network have access to the file also? Or I don't have permission to save? Hello everyone!! I m trying to use read twice on client first time is the size of buffer, 2nd time is the buffer.

I think I have to, coz I dnot know file size. So, I write twice on server as well -- 1st, filesize; 2nd, buffer. The problem is, sometimes, Need info:"talk,write and wall". Once communication is established, the two parties may type simultaneously; their output appears in separate windows. If you do not want to receive talk requests, you may block them using the mesg command.

By default, talk requests are normally not blocked. Certain commands, in particular nroff , pine , and pr , may block messages temporarily to preserve their output.