in reply to Re: Re: Re: sort array by value in it
in thread sort array by value in it

yea tried to understand the code before i used it think i understand it.
here is what i plugged it into..
it just a simpole script that uses mobile agents to relocate to another machine then run the code in do_it on that machine and returns a scalar containg the contents of df -Tm
these are then stored in a hash this is done for a couple of machines then the contents of the hash must be sorted to display a ranked listing of the machines with the most space available
#! /usr/bin/perl -w
#
# drivespace
#
use strict;
use Mobile::Executive;
my %space;

######################################################################
+######################################################

sub do_it
{
        return scalar `df -Tm`;
}

######################################################################
+#######################################################

relocate( 'xxx.xxx.xxx.xxx', 2001 );
$space{ 'xxx.xxx.xxx.xxx' } = do_it;
relocate( 'xxx.xxx.xxx.xxx', 2001 );
$space{ 'xxx.xxx.xxx.xxx'} = do_it;

#relocate( 'xxx.xxx.xxx.xxx', 2001 );
#$space { 'xxx.xxx.xxx.xxx'}= do_it;
#relocate( 'xxx.xxx.xxx.xxx', 2001 );
#$space = { 'xxx.xxx.xxx.xxx'}do_it;
#relocate( 'xxx.xxx.xxx.xxx', 2001 );
#$space = { 'xxx.xxx.xxx.xxx'}do_it;

relocate( 'xxx.xxx.xxx.xxx', 2001 );

my $counter = 1;
my @out;
my @lines;
my $disk_used = 0;
my $free = 0;

print "host:volume              available(MB)   %free\n";
foreach my $host (keys %space)
{
        $_ = $space{$host};
        @lines = map {
        /(\/\w+\/\w+)\s+\w+\s+\d+\s+\d+\s+(\d+)\s+(\d+)%/;
        {
                volume => $1,
                available => $2,
                free => 100 - $3,
        }
        }split /\n/,$space{$host};

        #This is the sorting line!
        @lines = sort { $b->{available} <=> $a->{available} } @lines;

        push @out, "$host:$_->{volume}    $_->{available}    $_->{free
+}%" for @lines;

}

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Edited by Chady -- removed real IPs

Replies are listed 'Best First'.
Re: Re: Re: Re: Re: sort array by value in it
by dragonchild (Archbishop) on May 04, 2004 at 15:54 UTC
    First, get those IP addresses off a public site. Think before you post!

    Second, you didn't understand the code I provided.

    1. Why are you setting $_ in the first line of the loop?
    2. Check your intendation in the map. It looks like you think the regex and hashref are part of the foreach-loop, not the map.
    3. This will provide a line in @out for each line in @lines. Make sure that's what you want.
    4. This will not skip lines as you were doing with the if-statement. Personally, I would do that kind of parsing in the do_it() function. But, you can do it in the map. 
    @lines = map {
        /(\/\w+\/\w+)\s+\w+\s+\d+\s+\d+\s+(\d+)\s+(\d+)%/;
        if ($1) {
                {
                        volume => $1,
                        available => $2,
                        free => 100 - $3,
                }
        }
        else {
                ()
        }
} split(/\n/, $space{$host});

    [download]

    I hope you're testing this in some test environment ...

    ------
    We are the carpenters and bricklayers of the Information Age.

    Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

    I shouldn't have to say this, but any code, unless otherwise stated, is untested

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