INFORMATICA_COMMAND_TASK

1.COMMAND TASK IN INFORMATICA IS USED TO RUN THE SHELL/UNIX COMMANDS DURING THE WORKFLOW.

2. WE CAN SPECIFY UNIX COMMANDS IN THE COMMAND TASK TO REMOVE REJECTED FILES,FTP FILES,CREATING FILES,COPY A FILE
   AND ARCHIVE A FILE ETC...

3. WE CAN USE ANY VALID UNIX COMMAND OR SHELL SCRIPT FOR UNIX SERVERS,OR ANY VALID DOS OR BATCH FILE FOR
   WINDOWS SERVERS.


TWO WAYS WE USE IT:


A) STANDALONE COMMAND TASK: WE CAN USE A COMMAND TASK ANYWHERE IN THE WORKFLOW OR WORKLET TO RUN SHELL COMMANDS.
   TASKS->CREATE->CHOOSE COMMAND->NAME IT.
 THIS TASK WE CAN USE 1. DIRECTLY 2. BY SELECTING TYPE (REUSABLE)-->SPECIFY COMMAND
 UNDER COMMANDS->WE WRITE COMMANDS


 1. ONE BY ONE COMMAND IT WILL EXECUTE IN THE ORDER WE HAVE SPECIFIED

 NOTE:
 ALTHOUGH ONE COMMAND FAILS IT WILL CONTINUE EXECUTION AND FINISH REMAINING COMMANDS EXECUTION AND KEEPS IN SUCCESS STATE.
 GOTO PROPERTIES AND CHECK "FAIL TASK IF ANY COMMAND FAILS"--THEN ONE COMMAND FAILS COMMAND FAILS

B) IN THE SESSTION PRE SESSION/POST SESSION SUCCESS /POST SESSION FAILURE
 NON REUSABLE-->TYPE COMMAND

 2. PRE AND POST SESSION COMMAND
  CALLING A COMMAND TASK AS THE PRE OR POST SESSION SHELL COMMAND FOR A SESSION TASK.


  WE CAN CALL THEM IN "COMPONENTS TAB" OF THE SESSION.WE CAN RUN THEM IN PRE SESSION/POST SESSION SUCCESS/POST SESSION FAILURE
  COMMAND.BY SELECTING THE TASK "TYPE" AND ITS VALUE.


  THREE TYPES--NONE,REUSABLE,NON REUSABLE




PRACTICALS:
SCENARIO 1: DELETE FILE BEFORE CREATING A NEW FILE IN THE SAME LOCATION
  START->COMMAND TASK->SESSION
 
  COMMAND TASK-->ERASE /DEL filePATH
SCENARIO 2:  TAKE BACK UP OF FILE ONCE IT IS CREATED
  START->SESSION
  SESSION->COMPONENTS->POST SESSION SUCCESS-> NON REUSABLE->COPY filePATH1  filePATH2
SCENARIO 3: 1 AND 2 IN SINGLE AREA
 
  START->SESSION
  SESSION->COMPONENTS TAB
  PRE SESSION->REUSABLE->COMMAND TASK NAME SPECIFY
  POST SESSION->NON REUSABLE-->COPY filePATH1 filePATH2