/myfiles/sandboxserver_local.tar.gz.part-aa
/myfiles/sandboxserver_local.tar.gz.part-ab
/myfiles/sandboxserver_local.tar.gz.part-ac
/myfiles/sandboxserver_shared.tar.gz.part-aa
/myfiles/sandboxserver_shared.tar.gz.part-ab
/myfiles/sandboxserver_shared.tar.gz.part-ac
/myfiles/sandboxserver_admin.tar.gz.part-aa
/myfiles/sandboxserver_admin.tar.gz.part-ab
/myfiles/sandboxserver_admin.tar.gz.part-ac
/myfiles/prodserver_local.tar.gz.part-aa
/myfiles/prodserver_local.tar.gz.part-ab
/myfiles/prodserver_local.tar.gz.part-ac
/myfiles/prodserver_shared.tar.gz.part-aa
/myfiles/prodserver_shared.tar.gz.part-ab
/myfiles/prodserver_shared.tar.gz.part-ac
/myfiles/prodserver_admin.tar.gz.part-aa
/myfiles/prodserver_admin.tar.gz.part-ab
/myfiles/prodserver_admin.tar.gz.part-ac
All these files are stored in one directory. I want to merge these files like sandboxserver_local.tar.gz, sandboxserver_shared.tar.gz, sandboxserver_admin.tar.gz,prodserver_local.tar.gz, prodserver_shared.tar.gz, prodserver_admin.tar.gz based on its name pattern........... can someone help ... thanks in advance