/usr/share/vim/vim73/tools/ref is in vim-runtime 2:7.3.429-2ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
#
# ref - Check spelling of the arguments
#
# Usage: ref word ..
#
# can be used for the K command of Vim
#
spell <<EOF
$*
EOF
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