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The 'wall' command is used to send a message to all users on the system. You can put the text of what you want each user to see in a file, or you can type the message in line by line and then send it.

To send the contents of a file to each user, use the command:

wall filename

to send a message and type the contents at the same time, type:

wall

first line of text

second line of text

...

^D

to send it.

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Q: Why do you use wall command in unix?
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