How to have a  trailing space character in authors file for git svn
<author>ashfame</author>
<author>clean</author>
<author>clean </author>
<author>rocketweb</author>

ashfame = Ashfame <mail@example.com>
clean = Yogesh Tiwari <yogesh.tiwari@example.com>
clean = Yogesh Tiwari <yogesh.tiwari@example.com>
"clean " = Yogesh Tiwari <yogesh.tiwari@example.com>
"clean " = Yogesh Tiwari <yogesh.tiwari@example.com>
rocketweb = rocketweb <rocketweb@rocketweb.com>
(no author) = Yogesh Tiwari <yogesh.tiwari@example.com>
(no author) = no_author

#!/bin/sh

git filter-branch --env-filter '

an="$GIT_AUTHOR_NAME"
am="$GIT_AUTHOR_EMAIL"
cn="$GIT_COMMITTER_NAME"
cm="$GIT_COMMITTER_EMAIL"

if [ "$GIT_COMMITTER_EMAIL" = "your@email.to.match" ]
then
    cn="Your New Committer Name"
    cm="Your New Committer Email"
fi
if [ "$GIT_AUTHOR_EMAIL" = "your@email.to.match" ]
then
    an="Your New Author Name"
    am="Your New Author Email"
fi

export GIT_AUTHOR_NAME="$an"
export GIT_AUTHOR_EMAIL="$am"
export GIT_COMMITTER_NAME="$cn"
export GIT_COMMITTER_EMAIL="$cm"
'