Broadcast message linux disable

How do I stop broadcast messages in Linux?

4 Answers. If they are using wall or write a similar method to write on your terminal or terminals, then mesg n will stop the messages from coming to you. If you mean something else, explain » broadcast messages » more precisely.

How do I turn off broadcast message?

There is no way to prevent a specific user from sending you wall (Write ALL) message outside of removing execute permissions to the wall command for that user.

How do I stop a Unix wall message?

The wall command will wait for you to enter text. When you’re done typing the message, press Ctrl+D to end the program and broadcast the message. 5

How do I broadcast a message in Linux?

Broadcast Message is a feature which allows a specific user to send messages and announcements to a larger group of users at once . The recipients, which can be hand selected by the sender from his/her contact list, receive the message as a standard instant message. 18

How do I turn off broadcast mode?

For now, privacy-conscious Android users can disable phones broadcasting this information while in sleep mode by visiting the «Advanced Wi-Fi Settings» menu, selecting , «Keep Wi-Fi On During Sleep» and setting it to «off».» 5

What is broadcast messages on Samsung?

Cell Broadcast is a type of text message similar to an SMS message that can be sent to all cell phone users in a given area . The typical use for these kinds of messages is to send emergency alerts to mobile users. Cell Broadcasts are part of the GSM standard.

How do I turn off Cell Broadcast on Huawei?

Cell Broadcast (CB) is a method of sending messages to multiple mobile telephone users in a defined area at the same time . . Unlike Short Message Service-Point to Point (SMS-PP), Cell Broadcast is a one-to-many geo-targeted and geo-fenced messaging service.

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Как отключить широковещательные сообщения в моем сеансе Linux?

Я получаю каждые 10 минут много широковещательных сообщений (возможно, от другого пользователя). Как я могу отключить эти широковещательные сообщения, чтобы не видеть их на моем экране?

Я не знаю, означает ли это ОП, но я ищу ответ на аналогичный вопрос. Я вижу широковещательные сообщения, которые отображаются в терминале при входе на удаленный сервер через SSH. Хотя это не совсем то же самое, похожие сообщения можно создать, войдя на ту же машину в другом терминале и введя «logger -p local3.emerg foobar». Это получает меня Broadcast message from systemd-journald@machine\nbla bla bla в каждом терминале. Это происходит на наших серверах Debian, но не на моем рабочем столе Ubuntu. mesg n не остановил их. Я ищу, чтобы отключить его только в этом терминале.

Если они используют стену или пишут подобный метод для записи на вашем терминале или терминалах, то mesg n остановит поступление сообщений к вам.

Если вы имеете в виду что-то еще, объясните «широковещательные сообщения» более точно.

Судя по вашим комментариям, вы все еще ожидаете ответа, поэтому вот тот, который вы не читали или не поняли:

Если у кого-то есть root на вашей машине, он может сделать все, что захочет, чтобы вас раздражать. Радуйтесь, что они не убивают ваши снаряды и не удаляют ваши файлы. Единственное, что вы можете сделать, чтобы остановить раздражение, это выйти из системы или попросить раздражающего человека остановиться. Там нет технического решения; Вы спрашиваете, где кнопка, чтобы какой-то ребенок прекратил бросать в вас камешки. Там нет такой кнопки.

Я предполагаю, что вы получаете сообщения, отправленные в окно командной строки / консоли. Если это так, попробуйте это:

Если сообщения не останавливаются, они, вероятно, приходят от пользователя / процесса с разрешениями корневого уровня, которые нельзя остановить.

Вы упомянули предсказуемый 10-минутный цикл. Это может указывать на то, что сообщение генерируется каким-то процессом-демоном. Возможно, этот процесс используется syslog для записи сообщений. Если это так, то возможно, что syslog он настроен на отправку сообщений, соответствующих определенным критериям, на пользовательские терминалы. Просмотрите /etc/syslog.conf возможные преступники. Документация, которую вы можете увидеть, запустив ее, man syslog.conf должна помочь вам начать работу. Я бы предложил начать с раздела «ПРИМЕРЫ».

Убедитесь, что $ mesg n применяется в вашем аккаунте. Если вы su перейдете к другому пользователю и попробуете эту команду, вы увидите mesg: cannot change mode .

Я отредактировал ваш ответ, если вы недовольны изменениями, не стесняйтесь отменить их или отредактировать.

Попробуйте установить loglevel=3 параметры загрузки.

Параметр loglevel подавляет все сообщения с уровнем, превышающим или равным указанному числу.

 0 - Critical, system unusable 1 - Immediate action required 2 - Critical event 3 - Error 4 - Warning 5 - Notice 6 - Informative 7 - Debugging information 

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How do I opt out of recieving broadcast messages?

I am logged in to a university system and a very annoying n00b thinks he or she is some awesome hacker because she or he can broadcast an object dump to everyone using pipes. I bet they think it is funny because it looks like the matrix. I was just wondering if there is a quick and easy way to opt out of recieving these messages from this user. Also what would be the command for all users (sometimes I would not want to recieve a message when I am in the depths of a difficult problem).

3 Answers 3

The command mesg n opts out of all messages. There is no way to prevent a specific user from sending you wall (Write ALL) message outside of removing execute permissions to the wall command for that user. The default permissions on my Ubuntu Linux computer allows for anyone to run wall and it will send messages to anyone who hasn’t opted out with mesg n . Last note on this issue, just run mesg to see the current Opt-in/out status for receiving messages.

The first thing I would do would be to report this clown to the admins. Unfortunately there’s no easy way for you to block him and only him.

The command to keep other users from writing messages on your terminal is mesg n . The mesg y command then allows writing again.

What this command does is to change the permissions of your terminal device file (e.g. /dev/tty0 or /dev/pts/8 , etc.) to allow or disallow other users from writing to it. Typing who am i at the command prompt will often show you the name of your device, with the /dev/ prefix stripped off.

The traditional UNIX permission system allows you to set permissions separately for yourself, for a single user group, and for all other users. If you and everyone you want to talk to happen to be a member of a group that the h4x0r is not in, it’s possible you could chgrp mygroup /dev/myterminal to set the file’s group, then chmod 620 /dev/myterminal to set the permissions. ( 620 is shorthand for «user can read/write, group can write, all others have no permissions».)

Applying an access control list to your device file might be a way to do what you want, but that’s system-dependent and non-standard, I’ve never done it, and it could cause problems for others if the login system isn’t expecting it.

Finally, for more info (just in case you don’t know already), try the man command — man chmod , man chgrp , etc.

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How to avoid Broadcast messages from syslog printed on the console

I have a written a small code to send messages to syslog using C Api’s when there is failure to connect to postgres database.

int main ( int argc, char **argv ) < PGconn *psql; PGresult *res; int flag = 0; openlog ( "postgres", LOG_NDELAY, LOG_SYSLOG ); psql = PQconnectdb("hostaddr = '127.0.0.0' port = '5432' dbname = 'RtpDb' user = 'rtp_user_99' password = 'rtp_user' connect_timeout = '10'"); if ( PQstatus(psql) != CONNECTION_OK ) < //Send an event to syslog for DB Connection Failure syslog (LOG_EMERG, "%s", PQerrorMessage(psql) ) >closelog (); PQclear(res); PQfinish(psql); > 

When there is a connection failure to postgres database the messages are printed on to the console even though the option LOG_CONS is not enabled in openlog.

Broadcast message from systemd-journald@blr09 (Tue 2017-01-03 05:24:46 EST): postgres[40933]: could not connect to server: Network is unreachable Is the server running on host "127.0.0.0" and accepting TCP/IP connections on port 5432? Message from syslogd@blr09 at Jan 3 05:24:46 . postgres:could not connect to server: Network is unreachable#012#011Is the server running on host "127.0.0.0" and accepting#012#011TCP/IP connections on port 5432? 

1 Answer 1

After the hint provided by @alk, i did some more research and found how to avoid the messages being printed on the console.

Broadcast message from systemd-journald@blr09 (Tue 2017-01-03 05:24:46 EST): postgres[40933]: could not connect to server: Network is unreachable Is the server running on host "127.0.0.0" and accepting TCP/IP connections on port 5432? Message from syslogd@blr09 at Jan 3 05:24:46 . postgres:could not connect to server: Network is unreachable#012#011Is the server running on host "127.0.0.0" and accepting#012#011TCP/IP connections on port 5432? 

The above message have two parts:

1. Broadcast message from systemd-journald => These messages will be printed on the console by journalctl when emergency messages are sent. To disable these messages we need to disable ForwardToWall ie., ForwardToWall=no in /etc/systemd/journald.conf
2. Message from syslogd => These messages are printed by rsyslog because of the below configuration line in /etc/rsyslog.conf

This selector-action states «Emergency messages often go to all users currently online to notify them that something strange is happening with the system. To specify this wall(1)-feature use an «:omusrmsg:*».» Comment this line out.

After performing the above operations the messages were not printed on the console. As these operations were not allowed due to security threats, I am raising the events with Alert priority.

syslog ( LOG_ALERT, "%s", PQerrorMessage(psql) ); 

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How to disable broadcast messages on my linux session?

I get every 10 min many broadcast messages (maybe by other user). How can I disable those broadcast messages, in order to not see them on my screen?

I don’t know if this is what the OP means, but I’m looking for the answer to a similar question. I’m seeing broadcast messages showing up in a terminal when logged in to a remote server over SSH. Although not exactly the same, similar messages can be created by logging in to the same machine in another terminal and typing «logger -p local3.emerg foobar». That gets me a Broadcast message from systemd-journald@machine\nbla bla bla in every terminal. This occurs on our debian servers, but not on my Ubuntu desktop. mesg n did not stop them. I’m looking to disable it only in this terminal.

4 Answers 4

If they are using wall or write a similar method to write on your terminal or terminals, then mesg n will stop the messages from coming to you.

If you mean something else, explain «broadcast messages» more precisely.

From your comments you seem to be still expecting an answer, so here is the one that you didn’t read or didn’t understand:

If someone has root on your machine, they can do anything they want to annoy you. Be glad they aren’t killing your shells and removing your files. The only thing you can do to stop the annoyance is log out or ask the irritating person to stop. There is no technical solution; you are asking where the button is to make some kid stop throwing pebbles at you. There is no such button.

I am assuming that you are getting messages sent to your command-line/console window. If that is the case try this:

If the messages don’t stop they are likely coming from a user/process with root-level permissions, which cannot be stopped.

You mentioned a predictable 10 minute cycle. That could indicate the message is being generated by some daemon process. Maybe that process is using syslog to record messages. If so, it is then possible that syslog is configured to send messages that match certain criteria to users’ terminals. Look through /etc/syslog.conf for possible culprits. The documentation you can see by running man syslog.conf should be able to get you started. I’d suggest starting with the «EXAMPLES» section.

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