On the MF, I now have 2 types of files:
        
        1) classic MVS files, and my JCL says
             DSNAME=
             
        2) Unix file know as HFS (Hierarchical File System)
            and my JCL says:
            PATH=
            
            
        on USS I have access to: my Home Directory (/u/<my user id>)
        I can create files here, I can deploy Java code here, etc.
        
        any other location, I need permission.
        
        I can see permission via the USS command 'ls -l'
        
        here is a sample output from ls -l command:
        
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
        
        here is how to read this line:
        
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
        ^ this first byte is a flag telling me what find of an etry I am looking at:
        
            - <- a regular file
            d <- a directory
            
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
         ^^^^^^^^^ permissions in sets of 3
                
              first set <- Owner permissions
              second set <- Group permissions
              thrid set <- Public permissions
        
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
                   ^^^^^^^  the Owner of this file/directory
                   
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
                           ^^^^ the Group of users
                           
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
                                      ^^^^ file size
                                      
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
                                           ^^^^^^^^^^^^ modification Date time
         
        -rw-r-xr-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
                                                        ^^^^^^^^^^ file/dir name


        -----------------------------------------------------------------
        -rw-r--r-- USER900 SYS1       1152 MAR 15 12:33 sample.jar
        
        Owner has:  rw-
        Group has:  r-x
        Public has: r--
        
        here is what these symbols mean:
        
                   File                              Direcory
     r (read) -  I can read this file              I can get a directory listing
     
     w (write) - I can delete/edit/rename          I can create/delete sub-directories
                                                       or I can move a file into this dir
     
     x (executable) - I can run this file          I can cd (change dir) into this dir
     
     
     I need: read permission to the jar to access 3rd party frameworks, I also
     need read permission to the directory those frameworks are in,
     I also need read permission to ALL the parent directory all the way up to root
          


     USS support 2 special permissions, and these can be a security risk:
     
     SETUID -> Set User ID, if this is turned on, the job running is running
                as if the Owner submitted it. If root owns this job then the job
                is running with root permission, and this could be VERY bad
     SETGID -> Set Group ID, if this is turned on, the job running is running
                as if the Group submitted it.