PL/SQL :: Indexes Output Format?

currently i am using below version

BANNER                                                                        
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production          
PL/SQL Release 11.2.0.1.0 - Production                                          
CORE     11.2.0.1.0     Production                                                        
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production                         
NLSRTL Version 11.2.0.1.0 - Production                                          
{CODE}

here is my query to find out the list of indexes and positions in a single schema.SELECT

user_indexes.TABLE_NAME||CHR(9)||
user_indexes.INDEX_NAME||CHR(9)||
TRIM(user_ind_columns.COLUMN_NAME)||CHR(9)||
user_ind_columns.column_position ||CHR(9)||

[code]...

i am trying to spool the output to .txt file. in textfile the output should be in below format :

Table_name Index_name column_names
---------------- ---------------- ------------------
ACS_TEST ACS_TEST_IDX COL1,COL2
C_COLLEGE INX_COLL STUDENT_ID,FIRST_NAME,LAST_NAME,DEPT_ID

Note : Based on the position value the column name have to be  placed.