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![]() What is z/OS UNIX? z/OS concepts |
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The z/OS® UNIX® shell and utilities provide an interactive interface to z/OS. The shell and utilities can be compared to the TSO function in z/OS. To perform some command requests, the shell calls other programs, known as utilities. The shell can be used to:
A user can invoke the z/OS UNIX shell in the following ways:
As an alternative to invoking the shell directly, a user can use ISHELL by entering the command ISHELL from TSO. ISHELL provides an ISPF panel interface to perform many actions for z/OS UNIX operations. Figure 2 shows an overview of these interactive interfaces, the z/OS UNIX shell and ISHELL. Also, there are some TSO/E commands that support z/OS UNIX, but they are limited to functions such as copying files and creating directories. The z/OS UNIX shell is based on the UNIX System V shell and has some of the features from the UNIX Korn shell. The POSIX standard distinguishes between a command, which is a directive to the shell to perform a specific task, and a utility, which is the name of a program callable by name from the shell. To the user, there is no difference between a command and a utility. The z/OS UNIX shell provides the environment that has the most functions and capabilities. It supports many of the features of a regular programming language. You can store a sequence of shell commands in a text file that can be executed. This is called a shell script. The TSO commands used with z/OS UNIX are:
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