How to use the command 'mesg' (with examples)
The mesg command is utilized in Unix-like operating systems to control whether a terminal session is available to receive messages from other users on the same system, typically via the write or talk commands. This command is particularly useful in multi-user environments where communication through terminals is necessary. By setting the message status, users can either permit or prevent others from sending messages directly to their terminals.
Check terminal’s openness to write messages
Code:
mesg
Motivation for use:
In environments where multiple users share the same machine, it’s crucial to know the current settings of your terminal regarding message reception. Imagine a shared server scenario where users occasionally need to exchange real-time information through terminal messages. Before proceeding to send or expect any messages, knowing whether your terminal session is currently set to receive or block incoming messages is necessary for smooth operation. By checking this status, users can effectively manage their communication settings without unexpected interruptions.
Explanation:
The mesg command without any additional argument checks the current status of your terminal’s message reception capability. When executed, it verifies if the terminal is set to accept messages (yes) or if it is blocking them (no).
Example output:
is y
In this example, the output is y indicates that the terminal is open to receiving messages.
Disallow receiving messages from the write command
Code:
mesg n
Motivation for use:
There are circumstances where users require privacy or need to focus without interruptions from incoming terminal messages. Consider a scenario where a user is running a critical task or presenting data on their terminal and must avoid any distractions. Using the mesg n command effectively blocks unwanted message notifications, ensuring the user can maintain full concentration on their task without unexpected interference.
Explanation:
The mesg command followed by the argument n (short for “no”) configures the terminal to disallow any incoming messages. This setting ensures that no user can interrupt the terminal session with messages until it is manually changed back to allow messages.
Example output:
Typically, there is no output, which implies that the terminal is successfully set to not receive any further messages.
Allow receiving messages from the write command
Code:
mesg y
Motivation for use:
In a cooperative or collaborative work environment, receiving real-time messages can greatly enhance communication efficiency. For example, when working as part of a multi-user team addressing a joint project, enabling your terminal to receive messages is crucial for timely updates and inputs. By setting the terminal to allow message reception, a user invites communication which can lead to more productive collaboration.
Explanation:
The mesg command followed by the argument y (short for “yes”) configures the terminal to allow incoming messages. This setting makes the terminal receptive to communications or alerts from other users.
Example output:
Like the previous example for disallowing messages, there is generally no output when successfully allowing messages, indicating that the terminal is set to accept messages.
Conclusion:
The mesg command is a simple yet powerful tool for managing communication within multi-user Unix-like systems. Whether you need to check your terminal’s message status, block undesirable interruptions, or enable communications to facilitate collaborative work, the mesg command provides adequate control through straightforward options. Familiarizing yourself with these settings enhances user autonomy and efficiency in shared computing environments.
