Hi
Can anyone please help with the following script I need - .ksh preferably?
I have external disks attached to a system that I have to label and then run the dd command on all external disk found.
I have kicked off the dd command as follows manually to see what its output is like first... (1 Reply)
Please forgive this I think rather basic question.
I have been away from UNIX for a very long time and am in need of some help.
I need to be able to check for the existance of a specific file name say 'file.dat' in a particular location
If the file exists then run a second process (at... (2 Replies)
I've written a script to check for Oracle's listener, eventman and pmon processes however there are several databases that startup which can take several minutes.
I'd like to add code to my current script that greps for the process “startup” and whether its condition is true or false. If the... (1 Reply)
Hi,
We are doing a process manually and i am trying to automate it.
This is the process.
We have a set of files in the directory /temp/d1. the number of files are dynamic.
For ex: if i have 5 files i want to compare the chatacters 45-58 of the last line of the first file with the same... (2 Replies)
Hello
I want to compare values of two variables as CHECK condition in a while loop.
eg:
var1=0
var2=10
while
do
echo " $var1 "
var1=`expr $var1 + 1`
done
However this is giving error.How to do it in a proper manner?
Thanks. (3 Replies)
Hi,
I am in trouble. I can get inside my condition test inside a loop :
I am in ksh (solaris)
while read file
do
<commande to retrieve file> >> ${LOG_RETRIEVE_FILE.log}
msg_err=$(cat ${LOG_RETRIEVE_FILE.log} | grep "error retrieve")
if ; then
<sendmail>
exit 1
fi
done
I tried... (6 Replies)
Hi,
I need a help with my script.
Below is my script. What I am doing here is finding the date of the file which I need to process and then finding the list of file names.
Based on the list of file names, check has to be done to see if all the files are there and log the details to a error... (3 Replies)
Hi Frnds,
i have a folder test in which files generated daily how to chek the files that are modified on that day as a condition for ex,
if
then echo "i have got something to do with the file"
else
echo" sorry"
fi
i will have more than 3 to 4 files that are modified today. and if... (5 Replies)
Hello All,
In ksh I am trying to ensure that user inputs are integers otherwise redisplay prompt with the following code;
a=0
b=0
c=0
read b?"Please enter a number: "
read c?"Please enter another number: "
while ] && ]; do
read b?"Not a number. Please enter a number: "
read c?"Not... (4 Replies)
Hi,
I Have to check two condition in while loop every 2 minutes. while loop is accompanied with number of times it will check.Please help in putting the two condition in while loop as appropriate.
z= input value,
A=1
while
do
1.check the file output,if the file output is N then keep on... (2 Replies)
Discussion started by: netdbaind
2 Replies
LEARN ABOUT DEBIAN
io::async::loop::select
IO::Async::Loop::Select(3pm) User Contributed Perl Documentation IO::Async::Loop::Select(3pm)NAME
"IO::Async::Loop::Select" - use "IO::Async" with "select(2)"
SYNOPSIS
Normally an instance of this class would not be directly constructed by a program. It may however, be useful for runinng IO::Async with an
existing program already using a "select" call.
use IO::Async::Loop::Select;
my $loop = IO::Async::Loop::Select->new;
$loop->add( ... );
while(1) {
my ( $rvec, $wvec, $evec ) = ('') x 3;
my $timeout;
$loop->pre_select( $rvec, $wvec, $evec, $timeout );
...
my $ret = select( $rvec, $wvec, $evec, $timeout );
...
$loop->post_select( $rvec, $evec, $wvec );
}
DESCRIPTION
This subclass of "IO::Async::Loop" uses the select(2) syscall to perform read-ready and write-ready tests.
To integrate with an existing "select"-based event loop, a pair of methods "pre_select" and "post_select" can be called immediately before
and after a "select" call. The relevant bits in the read-ready, write-ready and exceptional-state bitvectors are set by the "pre_select"
method, and tested by the "post_select" method to pick which event callbacks to invoke.
CONSTRUCTOR
$loop = IO::Async::Loop::Select->new
This function returns a new instance of a "IO::Async::Loop::Select" object. It takes no special arguments.
METHODS
$loop->pre_select( $readvec, $writevec, $exceptvec, $timeout )
This method prepares the bitvectors for a "select" call, setting the bits that the Loop is interested in. It will also adjust the $timeout
value if appropriate, reducing it if the next event timeout the Loop requires is sooner than the current value.
$readvec
$writevec
$exceptvec
Scalar references to the reading, writing and exception bitvectors
$timeout
Scalar reference to the timeout value
$loop->post_select( $readvec, $writevec, $exceptvec )
This method checks the returned bitvectors from a "select" call, and calls any of the callbacks that are appropriate.
$readvec
$writevec
$exceptvec
Scalars containing the read-ready, write-ready and exception bitvectors
$count = $loop->loop_once( $timeout )
This method calls the "pre_select" method to prepare the bitvectors for a "select" syscall, performs it, then calls "post_select" to
process the result. It returns the total number of callbacks invoked by the "post_select" method, or "undef" if the underlying select(2)
syscall returned an error.
SEE ALSO
o IO::Select - OO interface to select system call
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::Loop::Select(3pm)