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#!/bin/env bash
declare -a hostlist=$(grep -P '(?<!#)--hostname' *.ks | awk -F'=' '{pr
+int $2}')
...
do
    hostlist+="$host"
done

#!/usr/bin/env perl
use strict;
...
       close $fh;
    }
}

Provisioner]$ ./installer.pl 
Useless use of private variable in void context at ./installer.pl line
+ 13.
...
Use of uninitialized value $hostname in concatenation (.) or string at
+ ./installer.pl line 24, <$fh> line 1.

readline() on closed filehandle $fh at ./installer.pl line 27.

[################### Provisioner]$ ./installer.pl 

...


master.myhost.com[################### Provisioner]$