Interoperability between the shells and MVS

Figure 1. z/OS UNIX System Services provides the user interfaces of both MVS and UNIX

There is a high degree of interoperability between MVS™ and the z/OS shells:

You can move data between MVS data sets and the z/OS UNIX file system. You can copy or move MVS data sets into z/OS UNIX files; likewise, you can copy or move z/OS UNIX files into MVS data sets.
To work with z/OS UNIX files, you can use TSO/E commands or shell commands. If you have access to ISPF, you can use the panel interface of the ISPF shell. For example, you can create a directory with the TSO/E MKDIR command, or the shell mkdir command, or the ISPF shell.
You can issue TSO/E commands from the shell command line, from a shell script, or from a program. See Using commands to work with directories and files for a list of TSO/E commands you can use to work with the file system.
You can write job control language (JCL) that includes shell commands.
To edit z/OS UNIX files, you can use the ISPF/PDF full-screen editor or one of the editors available in the shell.
REXX programs can access kernel callable services by using z/OS UNIX extensions to the REstructured eXtended eXecutor (REXX) language. You can run REXX programs using these extensions from TSO/E, batch, the shell, or a C program.
Use the OSHELL REXX exec to run a non-interactive shell command or shell script from the TSO/E READY prompt and display the output to your terminal. This exec is shipped with z/OS UNIX System Services.