I wanted to broadcast message to all the bash terminal on my raspbian.
I understand that there's wall command to perform the step and I could use os.system python module to execute the command.
However, running the command "wall text.txt" requires sudo privilege. Is there any way to use wall command with stdin from python?
It is indeed required to be a superuser to run wall with an input file, man says:
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:
$ 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
>>>
you can use "echo" and pipe "|" it to wall.it's nit necessary to echo to fill first.
echo hello | wall
