Yep write is blocked but not wall.
And as Shane says super user is not blocked. (Thanks Shane :-) )
What worried me is that the man page for wall says:
snip---
Wall sends a message to everybody logged in with their mesg(1) permis-
sion set to yes.
snip---
But look at this test on Sl5.5:
fgibb...@comp ~ 0$ tty
/dev/pts/0
fgibb...@comp ~ 0$ mesg n
fgibb...@comp ~ 0$ wall foo
Broadcast message from fgibbins (pts/0) (Thu Nov 25 08:48:53 2010):
foo
fgibb...@comp ~ 0$ ls -l `which wall`
-r-xr-sr-x 1 root tty 10484 Jan 21 2009 /usr/bin/wall
fgibb...@comp ~ 0$ ls -l /dev/pts/0
crw------- 1 fgibbins tty 136, 0 Nov 25 08:50 /dev/pts/0
fgibb...@comp ~ 0$
Strange no?
Faye
PS I am not a super user.
On 24/11/10 18:59, Shane Voss wrote:
The man page for write (and for wall on another well known distro)
mention that mesg does not block the super-user. I suspect this may be
the cause of the confusion.
Shane
I tested it on i386 SL5.1 with 'write yellin pts/6', where "yellin" is my
username on that computer and "pts/6" is the ttyname on which I had typed
'mesg n'. The 'write ...' command was blocked to that terminal, though
not to
any of my other terminals for which 'mesg' returned "y". So as far as
I can
tell, 'mesg n' does what it's supposed to do.
Steven Yellin
On Wed, 24 Nov 2010, Faye Gibbins wrote:
Anyone know why 'mesg n' doesn't stop 'write' anymore on SL5.x?
--
---------------------------------------------------------
Faye Gibbins, Sys Admin. GeoS KB. Linux, Unix, Security
Beekeeper - The Apiary Project, KB - www.bees.ed.ac.uk
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