Redirect stdio into a string

[Initial-N]

Hi all,

How to catch all stdio output into a string?
I am using system() to call a external tool (exe), with some
arguments. Just doing so, it will print out all lot of data (which I
need to process it within the script). I wonder how I can catch all
the stdio ouput and redirect them into a string so that I can parse
it.

Thanks everyone!! I would like much appreciate if you can email at
(e-mail address removed)

Intial-N

 

[Anno Siegel]

Hi all,

How to catch all stdio output into a string?
I am using system() to call a external tool (exe), with some
arguments. Just doing so, it will print out all lot of data (which I
need to process it within the script). I wonder how I can catch all
the stdio ouput and redirect them into a string so that I can parse
it.

Read the system() documentation again.

Thanks everyone!! I would like much appreciate if you can email at
(e-mail address removed)

Post here, read here.

Anno

 

[pkent]

How to catch all stdio output into a string?
I am using system() to call a external tool (exe), with some
arguments. Just doing so, it will print out all lot of data (which I
need to process it within the script). I wonder how I can catch all
the stdio ouput and redirect them into a string so that I can parse
it.

It sounds like you want the backticks or qx() operator. This returns the
output of the command, like:

my $x = `ls`;
print length $x;

prints 46 just now.

P

 

[Bryan Castillo]

It sounds like you want the backticks or qx() operator. This returns the
output of the command, like:

my $x = `ls`;
print length $x;

prints 46 just now.

If there is alot of data to be processed it might me better
(more efficient) to open a pipe.

use strict;
use warnings;
use IO::File;

print "Listening ports: ";

my $proc = IO::File->new("netstat -a |") || die;
while (my $line = <$proc>) {
if ($line =~ /TCP\s+\S+\S+)\s+\S+\s+LISTENING/) {
print $1, " ";
}
}

print "\n";
$proc->close;

Both, my example and the examples using backticks `'s assume you only
want STDOUT. If you want STDERR (since it looks like you are using
windows - the reference to exe) you may have to look at IPC::Open3.
I don't think <some command> 2>&1 | would work on windows.