12-05-2006
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
hi, I have a list of filenames and I want to verify if they all exist. I know "if filename" would do the trick but how do I go about a list of files? thanks (3 Replies)
Discussion started by: mpang_
3 Replies
2. UNIX for Advanced & Expert Users
Hi everybody,
I need to check in C program wether a given login is known on the system. Is there any system function that could do this ?
So far, all I could find is getpwnam(), which answers my problem by parsing the local password database. But won't work if a user is authenticated by... (10 Replies)
Discussion started by: xavier054
10 Replies
3. AIX
Hello
I am having a requirement like if there is no file in the directory then i need a message to pop on after the execution of the script.
My script basically does for File in `ls -t $DIRECTORY | tail -1`;
if there is no file the DIRECTORY then the script is simply exiting with out... (2 Replies)
Discussion started by: dsdev_123
2 Replies
4. Shell Programming and Scripting
Hi
How can I check if the path exist or not?
echo "Enter path:";
read my_path;
##I should check whether my_path exists or not.... (5 Replies)
Discussion started by: tjay83
5 Replies
5. Shell Programming and Scripting
i want to check if the file is in the directory or not, and also it should be handle error conditions, like missing files and report the error and exit.
i did something like this:
file ="hello"
if !test -e "${file}"
then echo "No such files exist!"
exit 1
else
do something.......
fi
... (1 Reply)
Discussion started by: mingming88
1 Replies
6. UNIX for Dummies Questions & Answers
hi guys, im learning so be gentle...
i'm wanting to write a script to read in a customer number.
in order that the code is robust i want to check
1) the length of the value entered (4 characters)
2) that all characters entered are numeric between the values 1 to 3
3) that a value is... (1 Reply)
Discussion started by: skinnygav
1 Replies
7. UNIX for Dummies Questions & Answers
I need to check for the existence of a file *.log in a specific directory using a perl script.
Presently am not in that particular directory.
So i am using chdir ("/path/to/my/file)
And then i am using the -e in an if statement to check if it exists.
if (-e $File) {......}
$File contains the... (1 Reply)
Discussion started by: manutd
1 Replies
8. Shell Programming and Scripting
Hi All,
I want to check existence of variable, whose name gets decided dynamically.
E.g. value of this variable,is derived as $option_"exclude" , where value of option varies depending upon user input.
I am trying to do it in a following way :
set exclude_var = `echo $option"_exclude"`... (3 Replies)
Discussion started by: Rashmee
3 Replies
9. Shell Programming and Scripting
Hi
I have a requirement to check whether the files exists, then it will call other steps in shell script.
I did
ls *.csv|wc -l
if
then checking the count of the files should be more than 1 then it will call other steps.
I am getting the error that too many arguements as there n... (13 Replies)
Discussion started by: cnrj
13 Replies
10. Shell Programming and Scripting
hi
i wanted to check if the file exist or not(multiple files)
DIRE=/home/V478
if ;
then
echo "file present"
else
echo "file not present"
fi
But i am getting the error as
: [: unexpected operator/operand (3 Replies)
Discussion started by: ATWC
3 Replies
LEARN ABOUT DEBIAN
io::async::loop::poll
IO::Async::Loop::Poll(3pm) User Contributed Perl Documentation IO::Async::Loop::Poll(3pm)
NAME
"IO::Async::Loop::Poll" - use "IO::Async" with "poll(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 an "IO::Poll" object.
use IO::Poll;
use IO::Async::Loop::Poll;
my $poll = IO::Poll->new;
my $loop = IO::Async::Loop::Poll->new( poll => $poll );
$loop->add( ... );
while(1) {
my $timeout = ...
my $ret = $poll->poll( $timeout );
$loop->post_poll;
}
DESCRIPTION
This subclass of "IO::Async::Loop" uses an "IO::Poll" object to perform read-ready and write-ready tests.
To integrate with existing code that uses an "IO::Poll", a "post_poll" can be called immediately after the "poll" method on the contained
"IO::Poll" object. The appropriate mask bits are maintained on the "IO::Poll" object when notifiers are added or removed from the set, or
when they change their "want_writeready" status. The "post_poll" method inspects the result bits and invokes the "on_read_ready" or
"on_write_ready" methods on the notifiers.
CONSTRUCTOR
$loop = IO::Async::Loop::Poll->new( %args )
This function returns a new instance of a "IO::Async::Loop::Poll" object. It takes the following named arguments:
"poll" The "IO::Poll" object to use for notification. Optional; if a value is not given, a new "IO::Poll" object will be constructed.
METHODS
$count = $loop->post_poll( $poll )
This method checks the returned event list from a "IO::Poll::poll" call, and calls any of the notification methods or callbacks that are
appropriate. It returns the total number of callbacks that were invoked; that is, the total number of "on_read_ready" and "on_write_ready"
callbacks for "watch_io", and "watch_time" event callbacks.
$poll Reference to the "IO::Poll" object
$count = $loop->loop_once( $timeout )
This method calls the "poll" method on the stored "IO::Poll" object, passing in the value of $timeout, and then runs the "post_poll" method
on itself. It returns the total number of callbacks invoked by the "post_poll" method, or "undef" if the underlying "poll" method returned
an error.
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::Loop::Poll(3pm)