HP NonStop G-Series - Manual (Page 21)

1 Introduction to Open System Services
Open System Services (OSS) is the HP open computing interface to the NonStop operating system.
The OSS environment coexists with the Guardian environment and provides a fully independent
alternative to it. Open System Services interoperates with the NonStop operating system and makes
use of many of its unique features, such as fault tolerance and parallel processing. However, Open
System Services is not an operating system, and it does not replace portions of the NonStop
operating system.
Open System Services conforms to industry standards that define requirements for open computing
systems and portable applications. These standards include specifications for such features as
application program interfaces (APIs), run-time libraries, a command interpreter, and user commands
and utilities. Because the standards on which Open System Services is based are rooted in UNIX
standards, Open System Services and its features have a structure and feel similar to a UNIX
system.
Beginning with the J06.14 and H06.25 RVUs, the OSS Core Utilities product (T1202) provides
additional Open Source utilities. For information about the OSS Core Utilities, see
“OSS Core
Utilities User Commands” (page 185) .
OSS Components
Open System Services includes the following key components:
•
“OSS File System”
•
“OSS Command Interpreter (Korn Shell)”
•
“User Commands and Utilities”
•
“Access to HP Software ”
•
“OSS Reference Pages”
OSS File System
OSS has its own file system that is independent of and very different from the Guardian file system.
The OSS file system is hierarchical and composed of directories, subdirectories, and files. In
comparison the Guardian file system is flat.
For more information about the OSS file system, see Chapter 2 (page 26) .
OSS Command Interpreter (Korn Shell)
The OSS shell is the user interface (command interpreter) for Open System Services. At the shell
prompt you can enter user commands, execute utilities, create and manage files, start and stop
programs, control processes, write and execute shell scripts, and control certain OSS system
behavior. Open System Services uses the UNIX Korn shell. If you’ve used the Korn shell on UNIX
systems, you should quickly become comfortable with the OSS shell.
The OSS shell is comparable to HP Tandem Advanced Command Language (TACL) features in the
Guardian environment.
For more information about the OSS Shell, see Chapter 3 (page 31) .
Beginning with the J06.14 and H06.25 RVUs, the OSS Core Utilities product (T1202) provides
the BASH (Bourne-Again SHell) shell. For information about the OSS Core Utilities, see
OSS Core
Utilities User Commands (page 185) .
User Commands and Utilities
Most of the OSS user commands and utilities have direct counterparts in UNIX systems. Several
OSS commands are unique to the OSS set of user commands and provide special functions related
OSS Components 21