Get a list of some or all site variables and values.
drush variable-get
name : A string to filter the variables by. Variables whose name contains the string will be listed.
--exact : Only get the one variable that exactly matches the specified name. Output will contain only the variable's value.
List all variables and values.
drush vget
List all variables containing the string "user".
drush vget user
Show only the value of the variable with the exact key "site_mail".
drush vget site_mail --exact
Show only the variable with the exact key "site_mail" without changing the structure of the output.
drush vget site_mail --exact --pipe