I cannot seem to pass the value of the variable assigned in the "else" statment below to an "if" statement outside of the loop. When I debug using "set -x", I find that the value of "$A" is empty. Is there something I'm missing here? Code is below:
do
if ] then
echo "Good Match"... (2 Replies)
I have the following statement in script:
find ${LANDING_FILE_DIR}${BTIME_FILENAME_PATTERN2} -print | while read file; do
...
done
When there are no files located by the find comand it returns:
"find: bad status-- /home/rnitcher/test/....." to the command line
How do I get control in... (3 Replies)
Hi,
I have a strange problem and I'm sure its because I'm doing something stupid.
When I loop through all of the files in a directory they cannot be found.
Any help would be greatly appreciated.
Thanks,
-E
$ touch a.txt
$ touch b.txt
$ ls
a.txt b.txt
$ for f in `ls` ; do... (3 Replies)
Hi frnd , hv nice week ahead,
in shell script i found 2 words as below
1 ) targ_found=`sed -n \`echo $line_no\`p sesslog.txt | grep -ic 'Targ Rowid'`
2 ) bracket_found=`sed -n \`echo $line_no\`p sesslog.txt | grep -wc ')'`
now we got he line number of 2 words. now i want to... (1 Reply)
hi ,
I have certain files at the same path with differeent extensions like .dat , .txt etc ...........i need to rename them with extension .found at the same path with the help of loop....
also the files names will be like this ;
abc_2010_c1.dat
abc_2010_c2.dat
xyz_2010_c1.txt (2 Replies)
Hi All,
I have a simple script.sh file. It gives me " file.txt' for reading (no such file or directory)" Why can this happen?
%ls
ch1file.txt ch2file.txt ch3file.txt
% chmod +x script.sh
% bash
% ./script.sh
where script.sh is as follows
for i in seq(3)
do awk '{print $1}'... (1 Reply)
can any1 please tell me what is problem with following code:
i=1;
cat test| while read CMD;
do
Var$i=$CMD; or Var$i=$(echo $CMD) ;
let i++
doneI keep getting error :
line 4: Var1=sometext: command not found (2 Replies)
I am unable to use the value of a variable.
while ]
do
LstFldDataPart =`head -n "$LstFldDataPartCntr" "${FeedFileDir}/${FeedFileBadRecs}" | tail -1 | tr -d '\n'`
echo $LstFldDataPart
JndLstFldDataPart="${JndLstFldDataPart}${LstFldDataPart}"
LstFldDataPartCntr=... (3 Replies)
Hi, I have a control file which will contain all filenames(300) files. Loop through all the file names in the control files and check the existence of this file in another directory(same server). I need to infinitely(2 hrs) run this while loop until all the files are found. Once a file is found,... (5 Replies)
Dear Help,
Is it possible to continue the loop by going to the next available value, if the 'expected value' is not found. I have a list of values which might not get incremented by fixed value and hence the loop could break and the script could terminate.
Any suggestion is appreciated.
... (1 Reply)
Discussion started by: Indra2011
1 Replies
LEARN ABOUT DEBIAN
io::async::loop::epoll
IO::Async::Loop::Epoll(3pm) User Contributed Perl Documentation IO::Async::Loop::Epoll(3pm)NAME
IO::Async::Loop::Epoll - use "IO::Async" with "epoll" on Linux
SYNOPSIS
use IO::Async::Loop::Epoll;
use IO::Async::Stream;
use IO::Async::Signal;
my $loop = IO::Async::Loop::Epoll->new();
$loop->add( IO::Async::Stream->new(
read_handle => *STDIN,
on_read => sub {
my ( $self, $buffref ) = @_;
while( $$buffref =~ s/^(.*)
?
// ) {
print "You said: $1
";
}
},
) );
$loop->add( IO::Async::Signal->new(
name => 'INT',
on_receipt => sub {
print "SIGINT, will now quit
";
$loop->loop_stop;
},
) );
$loop->loop_forever();
DESCRIPTION
This subclass of IO::Async::Loop uses IO::Epoll to perform read-ready and write-ready tests so that the O(1) high-performance multiplexing
of Linux's epoll_pwait(2) syscall can be used.
The "epoll" Linux subsystem uses a registration system similar to the higher level IO::Poll object wrapper, meaning that better performance
can be achieved in programs using a large number of filehandles. Each epoll_pwait(2) syscall only has an overhead proportional to the
number of ready filehandles, rather than the total number being watched. For more detail, see the epoll(7) manpage.
This class uses the epoll_pwait(2) system call, which atomically switches the process's signal mask, performs a wait exactly as
epoll_wait(2) would, then switches it back. This allows a process to block the signals it cares about, but switch in an empty signal mask
during the poll, allowing it to handle file IO and signals concurrently.
CONSTRUCTOR
$loop = IO::Async::Loop::Epoll->new()
This function returns a new instance of a "IO::Async::Loop::Epoll" object.
METHODS
As this is a subclass of IO::Async::Loop, all of its methods are inherited. Expect where noted below, all of the class's methods behave
identically to "IO::Async::Loop".
$count = $loop->loop_once( $timeout )
This method calls the "poll()" method on the stored "IO::Epoll" object, passing in the value of $timeout, and processes the results of that
call. It returns the total number of "IO::Async::Notifier" callbacks invoked, or "undef" if the underlying "epoll_pwait()" method returned
an error. If the "epoll_pwait()" was interrupted by a signal, then 0 is returned instead.
SEE ALSO
o IO::Epoll - Scalable IO Multiplexing for Linux 2.5.44 and higher
o IO::Async::Loop::Poll - use IO::Async with poll(2)AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-04-10 IO::Async::Loop::Epoll(3pm)