HP-UX Reference (11i v1 00/12) - 1 User Commands N-Z (vol 2)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD

/build/1111/BRICK/man1/neqn.1

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sh-bourne(1) sh-bourne(1)

The options below are interpreted by the shell at invocation (thus they cannot be used with the set com-

mand). Unless the -c or -s option is speciﬁed, the ﬁrst non-option argument is assumed to be the name

of a ﬁle containing commands, and the remaining arguments are passed as positional parameters to that

command ﬁle.

-c string If the -c option is present then commands are read from string.

-s If the -s option is present or if no arguments remain, commands are read from the stan-

dard input. Any remaining arguments specify the positional parameters. Shell output

(except for "Special Commands" ) is written to ﬁle descriptor 2.

-i If the -i option is present or if the shell input and output are attached to a terminal, this

shell is interactive. In this case TERMINATE is ignored (so that kill 0 does not kill an

interactive shell) and INTERRUPT is caught and ignored (so that wait is interruptible).

In all cases, QUIT is ignored by the shell.

-r If the -r option is present the shell is a restricted shell.

The remaining options and arguments are described under the set command above.

rsh Only

rsh is used to set up login names and execution environments whose capabilities are more controlled than

those of the standard shell. The actions of rsh are identical to those of sh, except that the following are

disallowed:

• Changing directory (see cd(1)),

• Setting the value of

$PATH,

• Specifying path or command names containing /,

• Redirecting output (> and >>).

The restrictions above are enforced after .profile is interpreted.

When a command to be executed is found to be a shell procedure, rsh invokes sh to execute it. Thus, it

is possible to provide to the end-user shell procedures that have access to the full power of the standard

shell, while imposing a limited menu of commands; this scheme assumes that the end-user does not have

write and execute permissions in the same directory.

The net effect of these rules is that the writer of the

.profile has complete control over user actions, by

performing guaranteed setup actions and leaving the user in an appropriate directory (probably not the

The system administrator often sets up a directory of commands (such as

/usr/rbin) that can be safely

invoked by

rsh. Commands such as vi, sh, ksh, csh, and such that can break

rsh restrictions should

not be included in that directory. Some systems also provide a restricted editor

red.

EXTERNAL INFLUENCES

Environment Variables

LC_COLLATE determines the collating sequence used in evaluating pattern matching notation for ﬁle

name generation.

LC_CTYPE determines the interpretation of text as single and/or multi-byte characters, the classiﬁcation

of characters as letters, and the characters matched by character class expressions in pattern matching

notation.

LANG determines the language in which messages are displayed.

If LC_COLLATE or LC_CTYPE is not speciﬁed in the environment or is set to the empty string, the value

of LANG is used as a default for each unspeciﬁed or empty variable. If LANG is not speciﬁed or is set to the

empty string, a default of "C" (see lang(5)) is used instead of LANG. If any internationalization variable

contains an invalid setting, sh behaves as if all internationalization variables are set to "C". See

environ(5).

International Code Set Support

Single- and multi-byte character code sets are supported.

RETURN VALUE

The error codes returned by the shell are:

Section 1−−842 − 8 − HP-UX Release 11i: December 2000

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