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Full Discussion: Reminder script not working...
Homework and Emergencies Homework & Coursework Questions Reminder script not working... Post 302569796 by csharp100 on Tuesday 1st of November 2011 02:59:19 PM
Old 11-01-2011
Quote:
Originally Posted by vbe
Clue:
How are you going to get the $tty ?
Portion corrected
Code:
who | grep $LOGNAME | sed 's,.*\(pts/[0-9]*\).*, \1 ,' |
while read tty
do
  echo $MESSAGE | /dev/$tty
done
 
#
execution:
#
an12:/home/vbe $ who | grep $LOGNAME | sed 's,.*\(pts/[0-9]*\).*, \1 ,'|
> while read tty
> do
>   echo $MESSAGE | /dev/$tty
> done
/usr/bin/ksh[4]: /dev/pts/14: 0403-006 Execute permission denied.
/usr/bin/ksh[4]: /dev/pts/24: 0403-006 Execute permission denied.
/usr/bin/ksh[4]: /dev/pts/27: 0403-006 Execute permission denied.

You carry on now...
I believe I know where you are going. I used the above for loop instead but I think you are pointing out the fact that some users might have there tty's turned off for receiving messages. Is that correct? My time was limited on getting the assignment done. I had thought of that though.
 

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LEARN ABOUT REDHAT

pty

PTY(4)							   BSD Kernel Interfaces Manual 						    PTY(4)

NAME

     pty -- BSD-style compatibility pseudo-terminal driver

SYNOPSIS

     device pty

DESCRIPTION

     The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals.  When the device
     /dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver.  A device node for this terminal shall be created, which
     has the name /dev/ttyXX.

     New code should not try to allocate pseudo-terminals using this interface.  It is only provided for compatibility with older C libraries that
     tried to open such devices when posix_openpt(2) was being called.

FILES

     The BSD-style compatibility pseudo-terminal driver uses the following device names:

     /dev/pty[l-sL-S][0-9a-v]  Pseudo-terminal master devices.

     /dev/tty[l-sL-S][0-9a-v]  Pseudo-terminal slave devices.

DIAGNOSTICS

     None.

SEE ALSO

     posix_openpt(2), pts(4), tty(4)

HISTORY

     A pseudo-terminal driver appeared in 4.2BSD.

BUGS

     Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused.	A call to stat(2) on a nonexistent
     master device will already cause a new master device node to be created.  The master device can only be destroyed by opening and closing it.

     The pty driver cannot be unloaded, because it cannot determine if it is being used.

BSD
								  August 20, 2008							       BSD
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