drush handling array variable values I am using Drupal 7 and drush 7.4.0. How do I handle array variables with drush?

For example, I have a variable, social_sharing, for which

drush vget social_sharing 


Produces:

facebook: facebook
google_plus: google_plus
linkedin: linkedin
twitter: twitter
pininterest: pininterest


Using a drush command,


How can I get the value of only facebook using drush vget?
How can I delete one specific variable? for example if I want to remove google_plus from the list using drush vdel?
Step 1. Get the value of only facebook

drush ev '$v=variable_get("social_sharing"); print $v["facebook"]; print PHP_EOL';


Step 2. Remove google_plus from the list 

drush ev '$v=variable_get("social_sharing"); unset($v["google_plus"]); variable_set("social_sharing", $v);'