COND in JCL

COND=(0,EQ) OR COND=(0,EQ,STEP01) OR COND=ONLY OR COND=EVEN

0             = RETURN CODE 
EQ         = LOGICAL OPERATOR (WE CAN GIVE CONDITIONS LIKE (GT - GREATER THEN,                  LT - LESSER THEN, GE - GREATER THEN OR EQUAL TO, LE - LESSER THEN OR                  EQUAL TO, EQ - EQUAL TO, NE - NOT EQUAL TO)
STEP01 = STEP NAME WHICH RETURN CODE HAS TO BE CONSIDERED.


EQUAL TO & NOT EQUAL TO

Eg:
//STEP01  EXCE  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,     
//              COND=(0,EQ,STEP01)


HERE THE STEP02 WILL BE BY PASSED IF THE STEP01 ENDS WITH RETURN CODE 0
IF THE CONDITION IS TRUE THEN THE STEP WILL GET BY PASSED IF THE CONDITION IS FALSE THEN THE STEP WILL GET EXECUTED.

Eg:
//STEP01  EXEC  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,     
//              COND=(0,NE,STEP01) 

HERE THE STEP02 WILL GET EXECUTED IF THE STEP01 ENDS WITH RETURN CODE > 0

LESS THEN & GREATER THEN

Eg:
//STEP01  EXEC  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,     
//              COND=(04,LT,STEP01)


HERE THE STEP02 WILL BE BY PASSED IF THE STEP01 ENDS WITH RETURN CODE 0
IF THE CONDITION IS TRUE THEN THE STEP WILL GET BY PASSED IF THE CONDITION IS FALSE THEN THE STEP WILL GET EXECUTED.

Eg:
//STEP01  EXEC  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,     
//              COND=(0,GT,STEP01) 

HERE THE STEP02 WILL GET EXECUTED IF THE STEP01 ENDS WITH RETURN CODE < 0

EVEN & ONLY
Eg:
//STEP01  EXEC  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,     
//              COND=EVEN 

HERE THE STEP02 WILL GET EXECUTED EVEN IF THE PREVIOUS STEP ABENDS OR SUCCESSFUL

Eg:
//STEP01  EXEC  PGM=IKJEFT01
//
//STEP02  EXEC  PGM=IDCAMS,    
//              COND=ONLY 

HERE THE STEP02 WILL GET EXECUTED ONLY IF THE PREVIOUS STEPS ABENDS