Yes, it is exactly what my example tying to do.
But I am looking for more general way to pass vars.
This way I should escape all special characters that shell would interpret to be passed to perl.
For example:
(I think the '-l' is not necessary or it is?)
This way it works, but it is uglee and hard to prepare and debug!
---------- Post updated at 01:11 PM ---------- Previous update was at 12:49 PM ----------
Just found some simplifying with the double-qoutes: it is possible to comby the perl command by multiple quoted strings:
Code:
> v1=25;
> v2=30;
> perl -ne 'BEGIN{$v1='"$v1"'; $v2='"$v2"';} chomp; print "$_ | summ=".($v1+$v2)."\n"' input.txt
line one | summ=55
line two | summ=55
third line | summ=55
one more line | summ=55
>
This is usefull already, but it is still way around!
It should be a way to do it simpler!
What is the difference between defining the global variable through our and using use vars ?
Is the variable created using our goes beyond even package scope?
Thanks in Advance !!! (3 Replies)
Hi Folks,
The subject is my question:
Can we pass an array of strings from a Perl Program to a Shell Script?
Please provide some sample code.
Thanks
---------- Post updated at 11:52 PM ---------- Previous update was at 11:43 PM ----------
I got it.
Its here:... (0 Replies)
I have a perl script that opens a text file containing numbers on each line:
for example:
755993
755994
755995
755996
755997
755998
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I am reading a file using While loop
while <FILE>
{
$_ = <FILE>;
process data...
}
I would like to quit reading the file once I encounter a String pattern. How do i do it.
is it
if (/SUMMARY/)
{
last;
}
I am having problems with uninitialized value in pattern... (1 Reply)
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$ mgenv.sh prod
This would set environment variables for prod
$ mgenv.sh test
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I need shell 0r Perl script to read multiple input and do something and come out
example:
echo “ enter the host names separated by space “
read servers
foreach @servers
{ do
do something
done}
Here host names like host1 host2 host3 . . . . . . . so on
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Hi,
I have a requirement as follows. Have 3 files. Need to match up the data in each one of them and sum up the data by a field and display it. example given below.
File 1 : Name, Emp id
File 2 : Empid, Subject,
File 3 : Subject, Score, Class
Match Emp id in File 1 and File 2 and then... (7 Replies)
I am trying to capture screenshots from a huge list of URLs. I am able to manually capture images of individual pages; that is, I simply run the following command to get a screenshot of Foo.com
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I am working on converting shell to Perl script. In shell we have built in function
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Thanks for contribution (3 Replies)
Discussion started by: digioleg54
3 Replies
LEARN ABOUT DEBIAN
io::async::signal
IO::Async::Signal(3pm) User Contributed Perl Documentation IO::Async::Signal(3pm)NAME
"IO::Async::Signal" - event callback on receipt of a POSIX signal
SYNOPSIS
use IO::Async::Signal;
use IO::Async::Loop;
my $loop = IO::Async::Loop->new;
my $signal = IO::Async::Signal->new(
name => "HUP",
on_receipt => sub {
print "I caught SIGHUP
";
},
);
$loop->add( $signal );
$loop->run;
DESCRIPTION
This subclass of IO::Async::Notifier invokes its callback when a particular POSIX signal is received.
Multiple objects can be added to a "Loop" that all watch for the same signal. The callback functions will all be invoked, in no particular
order.
EVENTS
The following events are invoked, either using subclass methods or CODE references in parameters:
on_receipt
Invoked when the signal is received.
PARAMETERS
The following named parameters may be passed to "new" or "configure":
name => STRING
The name of the signal to watch. This should be a bare name like "TERM". Can only be given at construction time.
on_receipt => CODE
CODE reference for the "on_receipt" event.
Once constructed, the "Signal" will need to be added to the "Loop" before it will work.
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::Signal(3pm)