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where/README.md

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+Author: Andrew Mattingly: <[email protected]>
+Copyright IBM Corp. 2018
+
+This is an "IPA crawler" which can find out where an initialization parameter is set.  Load it into your SYS1.SAXREXEC and give it a whirl.
+It takes the name of a IEASYSxx parameter (or the corresponding PARMLIB member prefix) as a parameter, and reports the value detected at
+initialization, where it was set, and where to find the referenced PARMLIB datasets, if the value is a suffix or list of suffices.  It 
+also takes some "special parameters" for the "early stuff":  LOAD, IODF, {IEASYS|SYS|SYSPARM},{IEASYM|SYM} and NUCLST.
+
+For example:
+
+```
+@WHERE LOAD        
+LOAD = AL          
+SYS1.IPLPARM(LOADAL)
+@WHERE IODF
+IODF = 99  
+SYS1.IODF99
+@WHERE SYS                
+SYSPARM = AL              
+ADCD.Z21S.PARMLIB(IEASYSAL)
+@WHERE IEASYM              
+IEASYM = 00                
+ADCD.Z21S.PARMLIB(IEASYM00)
+@WHERE NUCLST        
+NUCLST = 00          
+SYS1.IPLPARM(NUCLST00)
+@WHERE OMVS                                    
+OMVS = (00,BP,IZ,CI,DB,IM,WA)
+Source: IEASYSAL
+ADCD.Z21S.PARMLIB(BPXPRM00)                    
+ADCD.Z21S.PARMLIB(BPXPRMBP)                    
+ADCD.Z21S.PARMLIB(BPXPRMIZ)                    
+ADCD.Z21S.PARMLIB(BPXPRMCI)                    
+ADCD.Z21S.PARMLIB(BPXPRMDB)                    
+ADCD.Z21S.PARMLIB(BPXPRMIM)                    
+ADCD.Z21S.PARMLIB(BPXPRMWA)
+@WHERE SQA                      
+SQA = (15,128)
+Source: IEASYSAL                    
+@WHERE VATLST              
+VAL = DB
+Source: IEASYSAL
+ADCD.Z21S.PARMLIB(VATLSTDB)
+```
+
+This REXX is somewhat imperfect - it doesn't cope with all the nuances of z/OS parameter configuration (but catches most of them).
+