如何使用带有 stdin 的 wall 命令向 python 中的所有 bash 终端广播消息？
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How do I broadcast messages to all bash terminal in python using wall command with stdin?
提问by SoGeeky
I wanted to broadcast message to all the bash terminal on my raspbian.
我想向我的 raspbian 上的所有 bash 终端广播消息。
I understand that there's wall command to perform the step and I could use os.system python module to execute the command.
我知道有 wall 命令来执行该步骤，我可以使用 os.system python 模块来执行该命令。
However, running the command "wall text.txt" requires sudo privilege. Is there any way to use wall command with stdin from python?
但是，运行命令“wall text.txt”需要 sudo 权限。有什么办法可以在 python 的 stdin 中使用 wall 命令吗？
回答by piokuc
It is indeed required to be a superuser to run wallwith an input file, mansays:
确实需要成为超级用户才能wall使用输入文件运行，man说：
NAME
wall - write a message to users
SYNOPSIS
wall [file]
DESCRIPTION
Wall displays the contents of file or, by default, its standard input, on the terminals of all currently logged in users.
Only the super-user can write on the terminals of users who have chosen to deny messages or are using a program which automatically denies messages.
Reading from a file is refused when the invoker is not superuser and the program is suid or sgid.
But you can do this:
但是你可以这样做：
$ echo hello hello >text.txt
$ python
Python 2.7.1 (r271:86832, Mar 18 2011, 09:09:48)
[GCC 4.5.0 20100604 [gcc-4_5-branch revision 160292]] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.system('cat text.txt | wall')
Broadcast Message from mak@vader
(/dev/pts/14) at 10:31 ...
hello hello
Broadcast Message from mak@vader
(/dev/pts/14) at 10:31 ...
hello hello
0
>>>
回答by ayhan
you can use "echo" and pipe "|" it to wall.it's nit necessary to echo to fill first.
你可以使用“echo”和管道“|” 它到墙。它没有必要先回声来填充。
echo hello | wall
