Cygwin: Unix filenames from Windows filenames

Here's a bash script that will help Cygwin reference Windows filenames. It could work under /bin/sh, but I wrote is as part of a bash .profile, so I've only tested it there.

#!/bin/bash
#
# sanify - turn a Windows path name into a Unix name
#  - turns drive letters into /cygdrive/drive,
#  - flips slashes, removes enclosing quotes,
#  - replaces unusual characters with '?'

function usage() { cat <<"EOF"
  Usage:    $1 'Windows filename'
  ... where 'Windows filename' only has to be in quotes if
  it has special characters, such as backslashes or spaces. 
  This is free.
EOF
} 

function sanify() {                       
    echo  ${@} | sed \
                -e 's,^[A-Za-z]:,/cygdrive/&,'\
                -e 's,:,,g' \
                -e 's,\\,/,g' \
                -e 's,^\",,g' \
                -e 's,\"$,,g' \
                -e 's,[^A-Za-z0-9_\.-],\?,g'        
}

if [ -t ] ; then
   [ -z "$@" ] && { usage "$0" }  
   sanify "${@}" else
   for name in `cat` ; do
        sanify "${name}"  
   done
fi