Provisioner]$ ./installer.pl 
Useless use of private variable in void context at ./installer.pl line 13.
Use of uninitialized value $_ in split 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.
Use of uninitialized value $_ in split at ./installer.pl line 13.
master.myhost.com
readline() on closed filehandle $fh at ./installer.pl line 27.
Use of uninitialized value $_ in split 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.
Use of uninitialized value $_ in split at ./installer.pl line 13.
Use of uninitialized value $fields[0] in string eq at ./installer.pl line 18, <$fh> line 1.
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.