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

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sh-posix(1) sh-posix(1)

1, 2, ... The positional parameters.

*, @ All the set positional parameters, separated by a ﬁeld separator character. See the "Quot-

ing" subsection.

# The number of set positional parameters in decimal.

- Flags supplied to the shell on invocation or by the set command.

? The decimal exit status returned by the last executed command.

$ The process number of this shell.

_ Initially, the absolute path name of the shell or script being executed, as passed in the

environment. Subsequently, it is assigned the last argument of the previous command.

This parameter is not set for commands which are asynchronous. This parameter is also

used to hold the name of the matching MAIL ﬁle when checking for mail.

! The process number of the last background command invoked.

ERRNO The value of errno as set by the most recently failed system call. This value is system-

dependent and is intended for debugging purposes.

LINENO The line number of the current line within the script or function being executed.

OLDPWD The previous working directory set by the cd command.

OPTARG The value of the last option argument processed by the getopts special command.

OPTERR If set to 0, OPTERR will suppress error messages from the getopts special command.

OPTERR is initiallyset to 1.

OPTIND The index of the last option argument processed by the getopts special command.

PPID The process number of the parent of the shell.

PWD The present working directory set by the cd command.

RANDOM Each time this parameter is evaluated, a random integer, uniformly distributed between 0

and 32767, is generated. The sequence of random numbers can be initialized by assigninga

numeric value to RANDOM.

REPLY Set by the select compound command, and by the read special command when no

name is supplied.

SECONDS Each time this parameter is referenced, the number of seconds since shell invocation is

returned. If this parameter is assigned a value, the value returned upon reference is the

value that was assigned plus the number of seconds since the assignment.

• The following parameters are used by the shell:

CDPATH The search path for the cd command, a list of directories separated by colons.

COLUMNS If this variable is set, its value is used to deﬁne the width of the edit window for the shell

edit modes and for printing select lists.

EDITOR If the value of this variable ends in emacs, gmacs,orvi and the

VISUAL variable is not

set, the corresponding option is turned on (see the

set special command.

ENV If this parameter is set, parameter substitution is performed on the value to generate the

path name of the script to be executed when the shell is invoked (see the "Invocation" sub-

section). This ﬁle is typically used for

alias and function deﬁnitions.

FCEDIT The default editor name for the fc command.

FPATH The search path for function deﬁnitions, a list of directories separated by colons. This path

is searched when a function with the

-u attribute is referenced and when a command is not

found. If an executable ﬁle is found, then it is read and executed in the current environ-

ment.

IFS Internal ﬁeld separators, normally space, tab, and newline, that are used to separate com-

mand words resulting from command or parameter substitution and for separating words

with the special command read. The ﬁrst character of the IFS parameter is used to

separate arguments for the $* substitution (see the "Quoting" subsection). If the value of

IFS is space, tab, and newline, or if IFS is unset and it is being used to separate the

Section 1−−858 − 14 − HP-UX Release 11i: December 2000

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