DESCRIPTION
 The 
mesg utility is invoked by a user to control write access others have to the terminal device associated with the standard error output. Write access is allowed by default, and programs such as 
talk(1) and 
write(1) may display messages on the terminal.
Options available:
- 
n
- 
Disallows messages.
- 
y
- 
Permits messages to be displayed.
If no arguments are given, mesg displays the present message status to the standard error output.
The mesg utility exits with one of the following values:
- 
 0
- 
Messages are allowed.
- 
 1
- 
Messages are not allowed.
- 
>1
- 
An error has occurred.