Very nice Peter. I also like using awk in JCL with datasets, although I prefer
just to put the scripts in zFS, like source code :-)
Much of my use of awk are small, quick, and dirty. It's often mixed in with
pipes of other shell commands. It's nice to be able to put your shell and awk
code inline in the JCL :
// EXEC PGM=COZBATCH friends don't let friends use BPXBATCH :-)
//INPUT DD DISP=SHR,DSN=...
//STDOUT DD ...
//STDIN DD *
awk '
...
...
' //DD:INPUT
//
BTW: z/OS awk is really disappointing to use if you are accustomed to using
gawk on linux.
I look forward to trying David Crayford's new port of gawk.
Kirk Wolf
Dovetailed Technologies
http://dovetail.com
Co:Z is available free under the terms of our Community License.
http://dovetail.com/support.html
On Tue, Dec 21, 2021, at 9:46 AM, Farley, Peter x23353 wrote:
> Technically you are correct - I depend on the undocumented fact that the awk
> implementation on z/OS Unix uses the fopen() function which supports DD
> statement file descriptions (//DD:ddname). Given IBM's legendary support for
> backwards compatibility, I sincerely doubt they will ever change this, though
> of course they certainly could. I only use awk in non-production test jobs
> for research and test data generation for regression tests, so no business
> impact if ever this changed.
>
> Typical JCL example:
>
> //AWKSPLIT EXEC PGM=BPXBATSL,MEMLIMIT=256M,
> // PARM='PGM /bin/awk --f //DD:SCRIPT //DD:TEXTIN'
> //STDOUT DD DISP=(NEW,CATLG,CATLG),
> // DSN=output.qsam.file,.name,
> // UNIT=TEST,SPACE=(CYL,(1,1),RLSE),
> // DSORG=PS,RECFM=VB,LRECL=8004,BLKSIZE=0,BUFNO=31
> //STDERR DD SYSOUT=*
> //SCRIPT DD DISP=SHR,DSN=TSOUSER.TEST.AWK(CSVSPLIT)
> // DD DISP=SHR,DSN=TSOUSER.TEST.AWK(STRFUNCS)
> // DD DISP=SHR,DSN=TSOUSER.TEST.AWK(STRFTIME)
> // DD DISP=SHR,DSN=TSOUSER.TEST.AWK(MKTIME)
> // DD DISP=SHR,DSN=TSOUSER.TEST.AWK(NEWTESTS)
> //TEXTIN DD DISP=SHR,DSN=input.qsam.or.pds.with.member.name,
> // BUFNO=31
> //STDIN DD DUMMY
> //
>
> My awk scripts are kept in a normal PDSE created using the IBM1047 code page
> (ISPF terminal type 28, 3278L1).
>
> HTH
>
> Peter
>
> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
> Paul Gilmartin
> Sent: Sunday, December 19, 2021 3:07 PM
> To: [email protected]
> Subject: Re: AWK ? - Re: Top 8 Reasons for using Python instead of REXX for
> z/OS
>
> EXTERNAL EMAIL
>
> On Sun, 19 Dec 2021 19:13:53 +0000, Farley, Peter x23353 wrote:
>
> >I have been using awk from JCL using DD's as script source, input and output
> >files for years now. There is no issue using awk in normal JCL. I even use
> >a gawk script for decoding CSV input that I wrote literally decades ago in
> >my JCL-invoked awk steps.
> >
> Does IBM support all that, or are you relying on "unpredictable" behavior?
>
> >JCL examples available on request.
> >
> Please. Especially "using DD's as script source". (Or do you just copy to a
> UNIX temporary file?)
>
> Thanks,
> gil
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Kirk Wolf
Dovetailed Technologies
http://dovetail.com
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