[CentOS] Script consumes memory

I have the following script that when executed, consumes memory and
makes the system inaccessible.  All process are halted.

First, I don't understand what is wrong with the script
Secondly, I'm surprised that Linux allows this to run unchecked to the
detriment of the entire system.

---- SCRIPT -----
#!/bin/sh
FTP="/usr/bin/ftp"
#
VMID="asystem.ourcompany.com"
VMUser="STATDASD"
VMPass="STATDASD"
VMDir="VMSYSA:."
DataFile="data.txt"
VMFile="DS8100.DATA"
#--- Get some information about me
#--work from the same directory as the script
MYSCRIPT=`$BASENAME $0`
MYSCRIPTDIR=`$DIRNAME $0`
if [ $MYSCRIPTDIR != "." ]
  then
  cd $MYSCRIPTDIR
fi
#--- FTP to MAINT on mkmfvm
$FTP -vn <<$$EOD
open $VMID
user $VMUser $VMPass
cd $VMDir
ascii
put $DataFile $VMFile
bye
$$EOD

Frank M. Ramaekers Jr.
Systems Programmer                   MCP, MCP+I, MCSE & RHCE
American Income Life Insurance Co.   Phone: (254)761-6649
1200 Wooded Acres Dr.                Fax:   (254)741-5777
Waco, Texas  76710
	

 



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