The OraCmd parameter descriptions are as follows:

delimiter: delimiter char ("|",",","#","TAB","WHITESPACE")

quote: quote char (quote="'" => single quotes, quote="chr(34)" => double quotes)

recorddelimiter: record delimiter, default is CRLF

header: y|n, print field name at first line

exportclob: y|n, export clob data to file

table: table name ("all" for unload all table)

query: sql query string (can not use multi-line sql)

sqlfile: sql script file contains the query you want to unload

schema: schema name, use this prameter to unload specific schema's data, if not set, use logon user's default schema

datafile: data file name

folder: data files folder (for unload all table)

dateformat: date format (e.g. "YYYY-MM-DD HH24:MI:SS")

timestampformat: timestamp format (e.g. ''YYYY-MM-DD-HH24.MI.SS.FF6'')

buffer: Number of rows that will be transferred across the network at the same time. 
  This property can have a great impact on performance. 
  So it is preferable to choose the optimal value of buffer for each SQL statement and software - hardware configuration experimentally. 
  The default value is 25.

quit = y|n (quit OraCmd after run batch file)