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+'\" et
+.TH HASH "1P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+hash
+\(em remember or report utility locations
+.SH SYNOPSIS
+.LP
+.nf
+hash \fB[\fIutility\fR...\fB]\fR
+.P
+hash -r
+.fi
+.SH DESCRIPTION
+The
+.IR hash
+utility shall affect the way the current shell environment remembers
+the locations of utilities found as described in
+.IR "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.
+.P
+Utilities provided as built-ins to the shell shall not be reported by
+.IR hash .
+.SH OPTIONS
+The
+.IR hash
+utility shall conform to the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 12.2" ", " "Utility Syntax Guidelines".
+.P
+The following option shall be supported:
+.IP "\fB\-r\fP" 10
+Forget all previously remembered utility locations.
+.SH OPERANDS
+The following operand shall be supported:
+.IP "\fIutility\fR" 10
+The name of a utility to be searched for and added to the list of
+remembered locations. If
+.IR utility
+contains one or more
+<slash>
+characters, the results are unspecified.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+The following environment variables shall affect the execution of
+.IR hash :
+.IP "\fILANG\fP" 10
+Provide a default value for the internationalization variables that are
+unset or null. (See the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 8.2" ", " "Internationalization Variables"
+for the precedence of internationalization variables used to determine
+the values of locale categories.)
+.IP "\fILC_ALL\fP" 10
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.IP "\fILC_CTYPE\fP" 10
+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).
+.IP "\fILC_MESSAGES\fP" 10
+.br
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written to standard error.
+.IP "\fINLSPATH\fP" 10
+Determine the location of message catalogs for the processing of
+.IR LC_MESSAGES .
+.IP "\fIPATH\fP" 10
+Determine the location of
+.IR utility ,
+as described in the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Chapter 8" ", " "Environment Variables".
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+The standard output of
+.IR 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
+.IR hash
+invocations that have been invoked, and may contain those invoked and
+found through the normal command search process.
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+The following exit values shall be returned:
+.IP "\00" 6
+Successful completion.
+.IP >0 6
+An error occurred.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+Since
+.IR 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:
+.sp
+.RS 4
+.nf
+
+nohup hash -r
+find . -type f | xargs hash
+.fi
+.P
+.RE
+.P
+it does not affect the command search process of the caller's
+environment.
+.P
+The
+.IR hash
+utility may be implemented as an alias\(emfor example,
+.IR alias
+.BR "\-t\ \-" ,
+in which case utilities found through normal command search are not
+listed by the
+.IR hash
+command.
+.P
+The effects of
+.IR hash
+.BR \-r
+can also be achieved portably by resetting the value of
+.IR PATH ;
+in the simplest form, this can be:
+.sp
+.RS 4
+.nf
+
+PATH="$PATH"
+.fi
+.P
+.RE
+.P
+The use of
+.IR hash
+with
+.IR 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.
+.SH EXAMPLES
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.9.1.1" ", " "Command Search and Execution"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Chapter 8" ", " "Environment Variables",
+.IR "Section 12.2" ", " "Utility Syntax Guidelines"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .