For discussion at http://stackoverflow.com/questions/17597268/export-every-revision-of-a-single-file-from-a-git-repository#17609591

export_snapshots

#!/bin/sh

#Usage: export_snapshots 'eppz!alert/EPPZAlert.m'

DESTINATION_PATH='Snapshots'
FILE_PATH=$1
FILE_NAME=$(basename $FILE_PATH)

echo 'Exporting <'$FILE_NAME'> located in <'$FILE_PATH'> to <'$DESTINATION_PATH'>.'

mkdir $DESTINATION_PATH
for COMMIT in $(git log --oneline $FILEPATH | cut -f 1 -d " "); do
git checkout $COMMIT $FILE_PATH
cp $FILE_PATH snapshots/$COMMIT'_'$FILE_NAME
done