Avoid duplicates in a particular field (say first 8 characters)
SORT FIELDS=(1,8,CH,A) SUM FIELDS=NONE
Sort first 8 characters, and omit few values
SORT FIELDS=(1,8,CH,A) OMIT COND=(1,8,CH,EQ,C'AAAAAAAA')
Sort first 8 characters, and include only few values
SORT FIELDS=(1,8,CH,A) INCLUDE COND=(1,8,CH,EQ,C'AAAAAAAA',OR, 1,8,CH,EQ,C'BBBBBBBB')
Sort card to select only 15 characters from 36th position of my input file.
//SORTSTEP EXEC PGM=SORT //SYSOUT DD SYSOUT=* //SORTIN DD DISP=SHR, // DSN=MYDSN.NAME //SORTWK01 DD UNIT=SYSDA,SPACE=(CYL,2000) //SORTWK02 DD UNIT=SYSDA,SPACE=(CYL,2000) //SORTWK03 DD UNIT=SYSDA,SPACE=(CYL,2000) //SYSIN DD * SORT FIELDS=COPY OUTFIL CONVERT, OUTREC=(1:36,15,65X) /* //SORTOUT DD DISP=(NEW,CATLG,DELETE), // SPACE=(CYL,(250,100),RLSE), // UNIT=DISK, // DCB=(RECFM=FB,LRECL=80,BLKSIZE=0), // DSN=MYDSN.OUTPUT.NAME
The 65X is given to fill the remaining 65 bytes of the output file with spaces.
Use this code 
thanks , it has been explained nicely.
thanks for explaining clearly with examples
thanks Gopinath !