first import

sites/all/modules/drush/examples/example.drush.ini

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+;
+; Example of a drush php settings override file
+;
+; IMPORTANT:  Before following the instructions in
+; this file, first check to see that the cli version
+; of php is installed on your system.  (e.g. On
+; debian systems, `sudo apt-get install php5-cli`.)
+;
+; Use this file in instances when your system is
+; -not- configured to use separate php.ini files for
+; webserver and cli use.  You can determine which
+; php.ini file drush is using by running "drush status".
+; If the php.ini file shown is your webserver ini
+; file, then rename this file, example.drush.ini,
+; to drush.ini and copy it to one of the following 
+; locations:
+;
+; 1. Drush installation folder
+; 2. User's .drush folder (i.e. ~/.drush/drush.ini)
+; 3. System wide configuration folder (i.e. /etc/drush/drush.ini)
+;
+; When in use, the variables defined in this file
+; will override the setting values that appear in
+; your php.ini file.  See the examples below for
+; some values that may need to be set in order for
+; drush to work.
+;
+; NOTE:  There is a certain amount of overhead
+; required for each override, so drush.ini should
+; only be used for a relatively small number
+; of variables.  Comment out any variable that
+; has the same value as the webserver php.ini
+; to keep the size of the override list small.
+;
+; To fully specify the value of all php.ini variables, 
+; copy your webserver php.ini file to one of the 
+; locations mentioned above (e.g. /etc/drush/php.ini)
+; and edit it to suit.
+;
+; The options listed below are particularly relevant
+; to drush.
+; 
+
+;
+; drush needs as much memory as Drupal in order
+; to run; make the memory limit setting match
+; what you have in your webserver's php.ini.
+;
+memory_limit = 128M
+
+;
+; Show all errors and direct them to stderr
+; when running drush.
+;
+error_reporting = E_ALL | E_NOTICE | E_STRICT
+display_errors = stderr
+
+;
+; If your php.ini for your webserver is too
+; restrictive, you can re-enable functionality
+; for drush by adjusting values in this file.
+;
+; Here are some examples of settings that are
+; sometimes set to restrictive values in a
+; webserver's php.ini:
+;
+;safe_mode = 
+;open_basedir = 
+;disable_functions =
+;disable_classes =