Alter site logo path using drush
No, there's no such command AFAIK.

Logo path is stored in the variable table along with all theme settings as an array. For example, My Theme will store all its settings, including log_path, in the theme_my_theme_settings.

If you know all the settings for the theme you can use the vset drush command to set your theme settings variable with the right value.

This is an example of a theme settings variable value for a subtheme from Zen theme:

array (
  'toggle_logo' =&gt; 1,
  'toggle_name' =&gt; 0,
  'toggle_slogan' =&gt; 0,
  'toggle_node_user_picture' =&gt; 0,
  'toggle_comment_user_picture' =&gt; 1,
  'toggle_favicon' =&gt; 1,
  'toggle_main_menu' =&gt; 0,
  'toggle_secondary_menu' =&gt; 0,
  'default_logo' =&gt; 1,
  'logo_path' =&gt; '',
  'logo_upload' =&gt; '',
  'default_favicon' =&gt; 0,
  'favicon_path' =&gt; 'public://favicon_1.ico',
  'favicon_upload' =&gt; '',
  'zen_breadcrumb' =&gt; 'yes',
  'zen_breadcrumb_separator' =&gt; ' › ',
  'zen_breadcrumb_home' =&gt; 1,
  'zen_breadcrumb_trailing' =&gt; 0,
  'zen_breadcrumb_title' =&gt; 1,
  'zen_skip_link_anchor' =&gt; 'main-menu',
  'zen_skip_link_text' =&gt; 'Jump to navigation',
  'zen_html5_respond_meta' =&gt; 
  array (
    'respond' =&gt; 'respond',
    'html5' =&gt; 'html5',
    'meta' =&gt; 'meta',
  ),
  'zen_rebuild_registry' =&gt; 0,
  'zen_wireframes' =&gt; 0,
  'favicon_mimetype' =&gt; 'image/vnd.microsoft.icon',
)


If you want to use vset with an array see this hint:

php -r "print json_encode(array('drupal', 'simpletest', 'leftandright', 'category'));"  | drush vset --format=json project_dependency_excluded_dependencies -