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Use of OVERLAY in ICETOOL

 
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ranjitherdci

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Joined: 17 Jun 2008
Posts: 10
Location: Bangalore

PostPosted: Tue Jun 17, 2008 3:01 pm    Post subject: Use of OVERLAY in ICETOOL
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Could someone explain me the use of overlay in icetool?
I am new to icetool.

Code:

//CTL1CNTL DD *                         
  INREC OVERLAY=(100:C'1')             
/*     


what is this '100' in overlay means?
Actually what is overlay's function?
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Aaru

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Joined: 03 Jul 2007
Posts: 1288
Location: Chennai, India

PostPosted: Tue Jun 17, 2008 3:53 pm    Post subject: Reply to: OVERLAY in ICETOOL
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ranjit,

Quote:
Could someone explain me the use of overlay in icetool?


Take a look at the DFSORT manual available in this site.

Quote:
//CTL1CNTL DD *
INREC OVERLAY=(100:C'1')
/*
what is this '100' in overlay means?


As per the above sort card you are updating the 100th byte in the output file with the character "1".
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ranjitherdci

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Joined: 17 Jun 2008
Posts: 10
Location: Bangalore

PostPosted: Tue Jun 17, 2008 5:37 pm    Post subject: Reply to: OVERLAY in ICETOOL
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Thanks alot aaru..

Could you please explain the following also

Code:

//CTL1CNTL DD *                               
  OUTFIL FNAMES=T1,BUILD=(1,10,101:1,10)     
/*


what does BUILD in the above sort card means
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Aaru

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Joined: 03 Jul 2007
Posts: 1288
Location: Chennai, India

PostPosted: Tue Jun 17, 2008 6:33 pm    Post subject: Reply to: OVERLAY in ICETOOL
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ranjith,

Quote:
//CTL1CNTL DD *
OUTFIL FNAMES=T1,BUILD=(1,10,101:1,10)
/*
what does BUILD in the above sort card means


By BUILD you are building your output record. Here in the output record you will have

1,10 -> first 10 bytes from input starting from pos 1 in the output.

101:1,10 -> Again in the 101st byte you will have the first 10 bytes of the input record.


Better read the manual and post your queries. Click the below link for the manual.



DFSORT Getting started
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ranjitherdci

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Joined: 17 Jun 2008
Posts: 10
Location: Bangalore

PostPosted: Tue Jun 17, 2008 7:13 pm    Post subject: Reply to: OVERLAY in ICETOOL
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Thank u so much..
I will also look into this material..
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Frank Yaeger

DFSORT Moderator


Joined: 15 Feb 2005
Posts: 7130
Location: San Jose, CA

PostPosted: Tue Jun 17, 2008 9:46 pm    Post subject:
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Ranjith,

For an explanation of DFSORT's BUILD and OVERLAY functions, see:

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ICE1CG20/2.4?DT=20060615173822

If you're not familiar with DFSORT and DFSORT's ICETOOL, I'd suggest reading through "z/OS DFSORT: Getting Started". It's an excellent tutorial, with lots of examples, that will show you how to use DFSORT, DFSORT's ICETOOL and DFSORT Symbols. You can access it online, along with all of the other DFSORT books, from:

www.ibm.com/servers/storage/support/software/sort/mvs/srtmpub.html
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