Dear Members,
I am using SCO-Unix 5.0.5. I have created 2 logical drives but some of the blocks are overlapped and are now giving warning during startup. I have used fsck to settle the problems but to no avail. Kindly help me to sort out the problem.
Thanks (3 Replies)
hi
i have the following scenario
#!/bin/sh
a=21.0
b=33.0
c=16.0
cmd=20
cmd1=30
if && ]
then
echo "problem....."
exit 1
else
echo "ok"
exit 0
fi
the issue here is the above condition is never TRUE coz a>cmd && b >cmd1 (7 Replies)
frnds..
can i perform an OR operation in sed syntax ?
if yes.. how?
I need to search for some 2-3 mail addresses in multiple files and delete all those... and instead of them.. I need to insert a new mail id...( these are also other emails in that list .. which sud not be affected )
is... (8 Replies)
Hi can someone please help me on this.
I need to perform this code:
Grep any lines that meets the following criteria
(A AND B) OR (A AND C)
I tried this code, but it didn't work
Grep-I "A &&B" | "A&&C" *.* $
thanks in advance (12 Replies)
Hi Fdz,
I have to verify the length of two uids are equals to 11 or not. The conditions is both lengths should be 11.I tried with this logic expr. am unable to get correct results.(Shell script in Unix i need)
if
do
echo"Results"
done
Thanx (2 Replies)
Hi,
I have a script testor.s which takes a string as command line argument,
Contents of the script:
#!/bin/ksh -x
if ]
then
echo "error"
else
echo "correct"
fi
Here, though i provide the command line argument as "WO_STMT_05292009", it displays error
Is there... (3 Replies)
I have this script to uvscan-update. Seems like that i am getting logical error at the end of the script. It is updating the script and also giving the error message to update it manually. I have deleted the DAT files to see if it will create new and it does. Below is the error and the script: ... (1 Reply)
So, I'm into about 650 lines of some code I'm working on. So I'll try to explain instead of flooding this post. Say I have some code like this:
int main() {
int i, j;
char data;
printf("Gimme something: ");
fgets(data, INPUT_BUFF, stdin);
for (j = 0; j < data; j++){... (6 Replies)
Discussion started by: Azrael
6 Replies
LEARN ABOUT REDHAT
listen
LISTEN(7) SQL Commands LISTEN(7)NAME
LISTEN - listen for a notification
SYNOPSIS
LISTEN name
INPUTS
name Name of notify condition.
OUTPUTS
LISTEN Message returned upon successful completion of registration.
WARNING: Async_Listen: We are already listening on name
If this backend is already registered for that notify condition.
DESCRIPTION
LISTEN registers the current PostgreSQL backend as a listener on the notify condition name.
Whenever the command NOTIFY name is invoked, either by this backend or another one connected to the same database, all the backends cur-
rently listening on that notify condition are notified, and each will in turn notify its connected frontend application. See the discussion
of NOTIFY for more information.
A backend can be unregistered for a given notify condition with the UNLISTEN command. Also, a backend's listen registrations are automati-
cally cleared when the backend process exits.
The method a frontend application must use to detect notify events depends on which PostgreSQL application programming interface it uses.
With the libpq library, the application issues LISTEN as an ordinary SQL command, and then must periodically call the routine PQnotifies to
find out whether any notify events have been received. Other interfaces such as libpgtcl provide higher-level methods for handling notify
events; indeed, with libpgtcl the application programmer should not even issue LISTEN or UNLISTEN directly. See the documentation for the
library you are using for more details.
NOTIFY [notify(7)] contains a more extensive discussion of the use of LISTEN and NOTIFY.
NOTES
name can be any string valid as a name; it need not correspond to the name of any actual table. If notifyname is enclosed in double-quotes,
it need not even be a syntactically valid name, but can be any string up to 63 characters long.
In some previous releases of PostgreSQL, name had to be enclosed in double-quotes when it did not correspond to any existing table name,
even if syntactically valid as a name. That is no longer required.
USAGE
Configure and execute a listen/notify sequence from psql:
LISTEN virtual;
NOTIFY virtual;
Asynchronous NOTIFY 'virtual' from backend with pid '8448' received.
COMPATIBILITY
SQL92
There is no LISTEN in SQL92.
SQL - Language Statements 2002-11-22 LISTEN(7)