Installation guide

language. The shell carries out commands either from a shell script or
interactively from a terminal keyboard.
In most respects, the DIGITAL UNIX C shell is the same as the ULTRIX C
shell. In the DIGITAL UNIX C shell, you must set an environment variable
to enable file name completion on a DIGITAL UNIX system and an
environment variable to enable command-line editing. (For information
about enabling file name completion, see Section 3.1.1. For information
about enabling command-line editing, see Section 3.1.)
The DIGITAL UNIX C shell does not support the hashstat built-in
command for debugging the shell. The hashstat command displays
statistics that indicate how effective the internal hash table has been at
locating commands.
Other than these differences, the DIGITAL UNIX C shell is the same as
the ULTRIX C shell. For information about porting C shell scripts, see
Section 3.2.3.
For more information about the DIGITAL UNIX C shell, see csh
(1).
2.4.2 Differences in the Korn Shell
The Korn shell is an interactive command interpreter and a command
programming language. The shell carries out commands either
interactively or from a shell script. The Korn shell contains many of the
features of the Bourne shell, as well as some C shell features.
The DIGITAL UNIX Korn shell is the same as the ULTRIX Korn shell. If
you use the ULTRIX Korn shell interactively, you should notice no
difference when you use the DIGITAL UNIX Korn shell interactively. Shell
scripts written for the ULTRIX Korn shell should run without modification
using the DIGITAL UNIX Korn shell.
For more information about the DIGITAL UNIX Korn shell, see ksh
(1).
2.4.3 Differences in the Bourne Shell
The Bourne shell is an interactive command interpreter and a command
programming language. The shell carries out commands either
interactively or from a shell script. The Bourne shell is the default system
shell on a DIGITAL UNIX system.
The ULTRIX system has two versions of the Bourne shell, sh and sh5. The
Bourne shell on the DIGITAL UNIX system is most similar to sh5.
If you use the sh shell on an ULTRIX system, you might notice the
following differences when you use sh on a DIGITAL UNIX system:
2–8 Overview of the DIGITAL UNIX User Environment