diff --git a/src/gam/gamlib/glcfg.py b/src/gam/gamlib/glcfg.py
index 227473ef..d22f3542 100644
--- a/src/gam/gamlib/glcfg.py
+++ b/src/gam/gamlib/glcfg.py
@@ -131,6 +131,8 @@ CSV_OUTPUT_ROW_DROP_FILTER = 'csv_output_row_drop_filter'
 CSV_OUTPUT_ROW_DROP_FILTER_MODE = 'csv_output_row_drop_filter_mode'
 # Limit number of output rows
 CSV_OUTPUT_ROW_LIMIT = 'csv_output_row_limit'
+# Output sort headers
+CSV_OUTPUT_SORT_HEADERS = 'csv_output_sort_headers'
 # Column header subfield name delimiter in CSV output file
 CSV_OUTPUT_SUBFIELD_DELIMITER = 'csv_output_subfield_delimiter'
 # Add timestamp column to CSV output file
@@ -350,6 +352,7 @@ Defaults = {
   CSV_OUTPUT_ROW_DROP_FILTER: '',
   CSV_OUTPUT_ROW_DROP_FILTER_MODE: 'anymatch',
   CSV_OUTPUT_ROW_LIMIT: '0',
+  CSV_OUTPUT_SORT_HEADERS: '',
   CSV_OUTPUT_SUBFIELD_DELIMITER: '.',
   CSV_OUTPUT_TIMESTAMP_COLUMN: '',
   CSV_OUTPUT_USERS_AUDIT: FALSE,
@@ -454,6 +457,7 @@ TYPE_LOCALE = 'locl'
 TYPE_PASSWORD = 'pass'
 TYPE_ROWFILTER = 'rowf'
 TYPE_STRING = 'stri'
+TYPE_STRINGLIST = 'strl'
 TYPE_TIMEZONE = 'tmzn'
 
 VAR_TYPE = 'type'
@@ -508,6 +512,7 @@ VAR_INFO = {
   CSV_OUTPUT_ROW_DROP_FILTER: {VAR_TYPE: TYPE_ROWFILTER},
   CSV_OUTPUT_ROW_DROP_FILTER_MODE: {VAR_TYPE: TYPE_CHOICE, VAR_CHOICES: {'allmatch': True, 'anymatch': False}},
   CSV_OUTPUT_ROW_LIMIT: {VAR_TYPE: TYPE_INTEGER, VAR_LIMITS: (0, None)},
+  CSV_OUTPUT_SORT_HEADERS: {VAR_TYPE: TYPE_STRINGLIST},
   CSV_OUTPUT_SUBFIELD_DELIMITER: {VAR_TYPE: TYPE_CHARACTER},
   CSV_OUTPUT_TIMESTAMP_COLUMN: {VAR_TYPE: TYPE_STRING, VAR_LIMITS: (0, None)},
   CSV_OUTPUT_USERS_AUDIT: {VAR_TYPE: TYPE_BOOLEAN},
diff --git a/src/gam/gamlib/glglobals.py b/src/gam/gamlib/glglobals.py
index b33d54ab..4e42a37b 100644
--- a/src/gam/gamlib/glglobals.py
+++ b/src/gam/gamlib/glglobals.py
@@ -81,6 +81,8 @@ CSV_OUTPUT_ROW_FILTER_MODE = 'corm'
 CSV_OUTPUT_ROW_LIMIT = 'corl'
 # Add timestamp column to CSV output file
 CSV_OUTPUT_TIMESTAMP_COLUMN = 'csv_output_timestamp_column'
+# Output sort headers
+CSV_OUTPUT_SORT_HEADERS = 'cosh'
 # CSV todrive options
 CSV_TODRIVE = 'todr'
 # Current API services
@@ -236,6 +238,7 @@ Globals = {
   CSV_OUTPUT_ROW_FILTER: [],
   CSV_OUTPUT_ROW_FILTER_MODE: True,
   CSV_OUTPUT_ROW_LIMIT: 0,
+  CSV_OUTPUT_SORT_HEADERS: [],
   CSV_OUTPUT_TIMESTAMP_COLUMN: None,
   CSV_TODRIVE: {},
   CURRENT_API_SERVICES: {},
diff --git a/src/gam/gamlib/glmsgs.py b/src/gam/gamlib/glmsgs.py
index ee26f725..2ccda24c 100644
--- a/src/gam/gamlib/glmsgs.py
+++ b/src/gam/gamlib/glmsgs.py
@@ -150,6 +150,7 @@ API_CALLS_RETRY_DATA = 'API calls retry data\n'
 API_CHECK_CLIENT_AUTHORIZATION = 'Please make sure the Client ID: {0} is authorized for the appropriate API or scopes:\n{1}\n\nRun: gam oauth create\n'
 API_CHECK_SVCACCT_AUTHORIZATION = 'Please make sure the Service Account Client name: {0} is authorized for the appropriate API or scopes:\n{1}\n\nRun: gam user {2} check serviceaccount\n'
 API_ERROR_SETTINGS = 'API error, some settings not set'
+ARE_BOTH_REQUIRED = 'Arguments {0} and {1} are both required'
 ARE_MUTUALLY_EXCLUSIVE = 'Arguments {0} and {1} are mutually exclusive'
 AS = 'as'
 ATTENDEES_ADD = 'Add Attendees'