Help using vim script capabilities

Hello!
I am attempting to use vim in a shell script to read in a file, edit it, and write it out to a new file. When I manually execute the individual vim commands it seems to work properly but when I put the commands in a script file and try to use that, the commands don't seem to work. My shell script generates a recursive file directory listing. I then want to use vim to edit the listing to replace any spaces in each file path with \space. I am including the shell below. HELP!
Thanks!
Michael

#!/bin/sh

# Generate a recursive list of full pathnames for all filenames that do not
# begin with a "."
find "$1" -type f -and \! -name ".*" > filelist1

# Generate the input script for the vim editor
# Go through the "find" listing and replace every " " with "\ "
cat << EOF > vimscript
:%s/ /\\ /g
:wq! md5shell
EOF

# Execute vim with the generated input script
vim -s vimscript filelist1

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