You can try this:

//LISTDIR  EXEC PGM=IKJEFT01,                   
//      PARM='HFSDIRC / /SERVICE'               
//*                                             
//SYSPROC  DD   DISP=SHR,DSN=SYS1.SBPXEXEC      
//         DD   DISP=SHR,DSN=userid.TEST.REXX  
//SYSTSPRT DD   SYSOUT=*                        
//SYSTSIN  DD   DUMMY                           
//*                                             
//*  

Then do some data manipulation. I sort with file manager. 

> On Sep 29, 2021, at 16:21, Paul Gilmartin 
> <0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote:
> 
> On Wed, 29 Sep 2021 15:47:42 -0400, James Crudele wrote:
> 
>> /* Rexx HFSDIRC */                         
>> parse arg dir1 dir2 junk                   
>> dir1  = strip(dir1)                        
>> dir2  = strip(dir2)                        
>> if dir1 = "" or dir2 = "" then do          
>>  say "Two directories must be specified" 
>>  exit 4                                  
>> end                                        
>> "oshell du "dir1" > /tmp/lsdir1"           
>> "oshell du "dir2" > /tmp/lsdir2"           
>> "oget '/tmp/lsdir1' 'userid.DIR1'"         
>> "oget '/tmp/lsdir2' 'userid.DIR2'" 
>> 
> Where do you do the compare?
> 
> "du" reports only the total number of blocks in each directory.
> I suspect the OP wanted greater precision.
> 
> What if the directories have non-portable names?
> 
> This would be more legible with less typing if you omit the TSO commands
> and run an OMVS exec.
> 
>>>> On Sep 28, 2021, at 22:22, Bruce Hewson wrote:
>>>     ...
>>> We are looking for a way to compare 2 filesystem structures, starting at 
>>> root '/'.
>>>    ...
> 
> -- gil
> 
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