I should be more careful

gistfile1.sh

function revert_last_commit()
{
        read -p "Are you sure you want to revert the last commit?[y/N] " -n 1 answer
        echo

        if test $answer = 'y'
        then
                svn up
                local head="$(svn info | grep Revision | cut -d' ' -f2)"
                local prev="$(expr $head - 1)"
                svn merge -r $head:$prev .
                svn commit -m "Revert last commit"

                svn up
                head="$(svn info | grep Revision | cut -d' ' -f2)"
                prev="$(expr $head - 1)"
                svn merge -r $head:$prev .
        fi
}