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Difference between SYSIN DD*, Dummy and DD DSL

 
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kanaiya_bhatt
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Joined: 06 Dec 2006
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PostPosted: Wed Dec 06, 2006 5:45 pm    Post subject: Difference between SYSIN DD*, Dummy and DD DSL
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what is difference between

//sysin dd *

and

//sysin dd dumy

and

//sysin dd dsl

WARNING: TITLE EDITED
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guptae

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Joined: 14 Oct 2005
Posts: 1191
Location: Bangalore,India

PostPosted: Wed Dec 06, 2006 5:57 pm    Post subject:
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Hi there,

SYSIN DD *:Instream data is perhaps the most common form of input. To include data in the input stream, code.SYSIN is often used as a ddname for instream data. The /* marks the end of the data.

Example

//SYSIN DD *
option copy
/*

//sysin dd dumy :DUMMY has meaning as NULLFILE and is used to suppress unused files. If you use it, it handles files as non existing.
You can use it for example in IDCAMS with various input and output files.
You have 20 input and 20 output files, but you only want to use the 9th thru 13th input/output files without changing the sysin instructions (REPRO).
So you set input/output file 1 thru 8 and 14 thru 20 to DD DUMMY.
It works, try it.

Please go through the manual before posting

If you use it in a concatenated DD statement, be careful, because it
identifies the EOF in the DD DUMMY, so it is the best way to place it
at the end of a DD instruction.

All parameters used after a DD DUMMY, are ignored, this is the difference between NULLFILE and DD DUMMY. NULLFILE recognizes applied parameters.
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