1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
.\"
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for
.\" permission to reproduce portions of its copyrighted documentation.
.\" Original documentation from The Open Group can be obtained online at
.\" http://www.opengroup.org/bookstore/.
.\"
.\" The Institute of Electrical and Electronics Engineers and The Open
.\" Group, have given us permission to reprint portions of their
.\" documentation.
.\"
.\" In the following statement, the phrase ``this text'' refers to portions
.\" of the system documentation.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition,
.\" Standard for Information Technology -- Portable Operating System
.\" Interface (POSIX), The Open Group Base Specifications Issue 6,
.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics
.\" Engineers, Inc and The Open Group. In the event of any discrepancy
.\" between these versions 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.
.\"
.\" This notice shall appear on any product containing this material.
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
.\"
.\"
.\" Copyright 1989 AT&T
.\" Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved
.\" Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved.
.\"
.TH HASH 1 "Jul 17, 2002"
.SH NAME
hash, rehash, unhash, hashstat \- evaluate the internal hash table of the
contents of directories
.SH SYNOPSIS
.LP
.nf
\fB/usr/bin/hash\fR [\fIutility\fR]
.fi
.LP
.nf
\fB/usr/bin/hash\fR [\fB-r\fR]
.fi
.SS "sh"
.LP
.nf
\fBhash\fR [\fB-r\fR] [\fIname\fR]...
.fi
.SS "csh"
.LP
.nf
\fBrehash\fR
.fi
.LP
.nf
\fBunhash\fR
.fi
.LP
.nf
\fBhashstat\fR
.fi
.SS "ksh"
.LP
.nf
\fBhash\fR [\fIname\fR]...
.fi
.LP
.nf
\fBhash\fR [\fB-r\fR]
.fi
.SH DESCRIPTION
.SS "/usr/bin/hash"
.sp
.LP
The \fB/usr/bin/hash\fR utility affects the way the current shell environment
remembers the locations of utilities found. Depending on the arguments
specified, it adds utility locations to its list of remembered locations or it
purges the contents of the list. When no arguments are specified, it reports on
the contents of the list. The \fB-r\fR option causes the shell to forget all
remembered locations.
.sp
.LP
Utilities provided as built-ins to the shell are not reported by \fBhash\fR.
.SS "sh"
.sp
.LP
For each \fIname\fR, the location in the search path of the command specified
by \fIname\fR is determined and remembered by the shell. The \fB-r\fR option to
the \fBhash\fR built-in causes the shell to forget all remembered locations. If
no arguments are given, \fBhash\fR provides information about remembered
commands. The \fIHits\fR column of output is the number of times a command has
been invoked by the shell process. The \fICost\fR column of output is a measure
of the work required to locate a command in the search path. If a command is
found in a "relative" directory in the search path, after changing to that
directory, the stored location of that command is recalculated. Commands for
which this will be done are indicated by an asterisk (\fB*\fR) adjacent to the
\fIHits\fR information. \fICost\fR will be incremented when the recalculation
is done.
.SS "csh"
.sp
.LP
\fBrehash\fR recomputes the internal hash table of the contents of directories
listed in the \fBpath\fR environmental variable to account for new commands
added.
.sp
.LP
\fBunhash\fR disables the internal hash table.
.sp
.LP
\fBhashstat\fR prints a statistics line indicating how effective the internal
hash table has been at locating commands (and avoiding \fBexec\fRs). An
\fBexec\fR is attempted for each component of the \fIpath\fR where the hash
function indicates a possible hit and in each component that does not begin
with a '\|/\|'.
.SS "ksh"
.sp
.LP
For each \fIname\fR, the location in the search path of the command specified
by \fIname\fR is determined and remembered by the shell. The \fB-r\fR option to
the \fBhash\fR built-in causes the shell to forget all remembered locations. If
no arguments are given, \fBhash\fR provides information about remembered
commands.
.SH OPERANDS
.sp
.LP
The following operand is supported by \fBhash\fR:
.sp
.ne 2
.na
\fB\fIutility\fR \fR
.ad
.RS 12n
The name of a utility to be searched for and added to the list of remembered
locations.
.RE
.SH OUTPUT
.sp
.LP
The standard output of \fBhash\fR is 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 consists of
those utilities named in previous \fBhash\fR invocations that have been
invoked, and may contain those invoked and found through the normal command
search process.
.SH ENVIRONMENT VARIABLES
.sp
.LP
See \fBenviron\fR(5) for descriptions of the following environment variables
that affect the execution of \fBhash\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.sp
.ne 2
.na
\fB\fBPATH\fR \fR
.ad
.RS 9n
Determine the location of \fIutility\fR.
.RE
.SH EXIT STATUS
.sp
.LP
The following exit values are returned by \fBhash\fR:
.sp
.ne 2
.na
\fB\fB0\fR \fR
.ad
.RS 7n
Successful completion.
.RE
.sp
.ne 2
.na
\fB\fB>0\fR \fR
.ad
.RS 7n
An error occurred.
.RE
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Standard
.TE
.SH SEE ALSO
.sp
.LP
\fBcsh\fR(1), \fBksh\fR(1), \fBsh\fR(1), \fBattributes\fR(5), \fBenviron\fR(5),
\fBstandards\fR(5)
|
