Change Drupal default theme with Drush

Setting Drupal Default Theme with Drush.txt

# How to know what is the current theme on your Drupal site
# move inside project root directory var/www  and then
  drush status theme
#the above command will tell you the current theme set as default for site and admin both
    
# Change the site default theme using the below command (use theme name of your choice)
  drush vset theme_default garland
# the above command will make garland as default site theme
    
# now change admin default theme using the below command (use theme name of your choice)
   drush vset admin_theme garland
# Do Ctrl+r to flush cache and reload your Drupal Site