Thanks ever so much for your help Roboticus. I have tried this out and this is now matching up these key values perfectly. I just have one question though. Maybe it because I dont fully understand all of your code but when I run this its seems to print out lines more than once. This seems to happen when either %filer_device is a hash or %filer_volume is a hash or both are hashes. So for example in the following section: 

"rtsys_mpt": {
                "%export_name": "/bb/rtsys",
                "%filer_device": {
                    "@west": "nydevnfs_rtsysgit",
                    "@ridge": "njdevnfs_rtsysgit"
                },
                "%filer_volume": "/vol/rtsysgit"
            }

[download]

When I run your code on this and just purely print out the volume and device values i get the lines duplicated like so: 

njdevnfs_rtsysgit =  /vol/rtsysgit
nydevnfs_rtsysgit =  /vol/rtsysgit
njdevnfs_rtsysgit =  /vol/rtsysgit
nydevnfs_rtsysgit =  /vol/rtsysgit

[download]

All that I need is this: 

njdevnfs_rtsysgit =  /vol/rtsysgit
nydevnfs_rtsysgit =  /vol/rtsysgit

[download]

But for some reason its duplicated? I am not too sure why? and in this section where %filer_device and %filer_volume are both hashes it outputs the same lines 3 times: 

"build18_mpt": {
                "%export_name": "/bb/mobile",
                "%filer_device": {
                    "@west": "nydevnfs_mob_build",
                    "@ridge": "rnap2113-s"
                },
                "%filer_volume": {
                    "@west": "/vol/mob_build",
                    "@ridge": "/vol/mob_build_c"
                }
            },

[download]
nydevnfs_mob_build =  /vol/mob_build
rnap2113-s =  /vol/mob_build_c
nydevnfs_mob_build =  /vol/mob_build
rnap2113-s =  /vol/mob_build_c
nydevnfs_mob_build =  /vol/mob_build
rnap2113-s =  /vol/mob_build_c

[download]

All i need is the first two lines. The others are duplicates: 

nydevnfs_mob_build =  /vol/mob_build
rnap2113-s =  /vol/mob_build_c

[download]

Do you know why this is happening please?

In reply to Re^2: How to check that keys in two hashes match and get the corresponding values by NewLondonPerl1
in thread How to check that keys in two hashes match and get the corresponding values by NewLondonPerl1

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