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hashposix - Online in the Cloud

Run hashposix in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command hashposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


hash — remember or report utility locations

SYNOPSIS


hash [utility...]

hash −r

DESCRIPTION


The hash utility shall affect the way the current shell environment remembers the
locations of utilities found as described in Section 2.9.1.1, Command Search and
Execution. Depending on the arguments specified, it shall add utility locations to its
list of remembered locations or it shall purge the contents of the list. When no arguments
are specified, it shall report on the contents of the list.

Utilities provided as built-ins to the shell shall not be reported by hash.

OPTIONS


The hash utility shall conform to the Base Definitions volume of POSIX.1‐2008, Section
12.2, Utility Syntax Guidelines.

The following option shall be supported:

−r Forget all previously remembered utility locations.

OPERANDS


The following operand shall be supported:

utility The name of a utility to be searched for and added to the list of remembered
locations. If utility contains one or more <slash> characters, the results are
unspecified.

STDIN


Not used.

INPUT FILES


None.

ENVIRONMENT VARIABLES


The following environment variables shall affect the execution of hash:

LANG Provide a default value for the internationalization variables that are unset or
null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2,
Internationalization Variables for the precedence of internationalization
variables used to determine the values of locale categories.)

LC_ALL If set to a non-empty string value, override the values of all the other
internationalization variables.

LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data
as characters (for example, single-byte as opposed to multi-byte characters in
arguments).

LC_MESSAGES
Determine the locale that should be used to affect the format and contents of
diagnostic messages written to standard error.

NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES.

PATH Determine the location of utility, as described in the Base Definitions volume
of POSIX.1‐2008, Chapter 8, Environment Variables.

ASYNCHRONOUS EVENTS


Default.

STDOUT


The standard output of hash shall be used when no arguments are specified. Its format is
unspecified, but includes the pathname of each utility in the list of remembered locations
for the current shell environment. This list shall consist of those utilities named in
previous hash invocations that have been invoked, and may contain those invoked and found
through the normal command search process.

STDERR


The standard error shall be used only for diagnostic messages.

OUTPUT FILES


None.

EXTENDED DESCRIPTION


None.

EXIT STATUS


The following exit values shall be returned:

0 Successful completion.

>0 An error occurred.

CONSEQUENCES OF ERRORS


Default.

The following sections are informative.

APPLICATION USAGE


Since hash affects the current shell execution environment, it is always provided as a
shell regular built-in. If it is called in a separate utility execution environment, such
as one of the following:

nohup hash −r
find . −type f | xargs hash

it does not affect the command search process of the caller's environment.

The hash utility may be implemented as an alias—for example, alias −t , in which case
utilities found through normal command search are not listed by the hash command.

The effects of hash −r can also be achieved portably by resetting the value of PATH; in
the simplest form, this can be:

PATH="$PATH"

The use of hash with utility names is unnecessary for most applications, but may provide a
performance improvement on a few implementations; normally, the hashing process is
included by default.

EXAMPLES


None.

RATIONALE


None.

FUTURE DIRECTIONS


None.

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