mirror of https://github.com/GnoConsortium/gno.git
276 lines
6.5 KiB
Groff
276 lines
6.5 KiB
Groff
.\" Copyright (c) 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)test.1 6.6 (Berkeley) 6/8/92
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.\"
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.\" $Id: test.1,v 1.3 1999/07/03 14:36:14 gdr-ftp Exp $
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.\"
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.TH TEST 1 "19 October 1997" GNO "Commands and Applications"
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.SH NAME
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test \- Condition evaluation utility.
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.SH SYNOPSIS
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.B test
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.I expression
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.SH DESCRIPTION
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The
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.B test
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utility evaluates the expression and, if it evaluates
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to true, returns a zero (true) exit status; otherwise
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it returns 1 (false).
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If there is no expression, test also
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returns 1 (false).
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.LP
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All operators and flags are separate arguments to the
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.B test
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utility.
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.LP
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The following primaries are used to construct
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.IR expression :
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.IP "\fB-b\fR \fIfile\fR"
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True if
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.I file
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exists and is a block special
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file.
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.IP "\fB-c\fR \fIfile\fR"
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True if
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.I file
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exists and is a character
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special file.
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.IP "\fB-d\fR \fIfile\fR"
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True if
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.I file
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exists and is a directory.
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.IP "\fB-e\fR \fIfile\fR"
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True if
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.I file
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exists (regardless of type).
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.IP "\fB-f\fR \fIfile\fR"
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True if
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.I file
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exists and is a regular file.
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.IP "\fB-g\fR \fIfile\fR"
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True if
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.I file
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exists and its set group ID flag
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is set.
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.IP "\fB-n\fR \fIstring\fR"
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True if the length of
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.I string
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is nonzero.
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.IP "\fB-p\fR \fIfile\fR"
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True if
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.I file
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is a named pipe (FIFO).
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.IP "\fB-r\fR \fIfile\fR"
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True if
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.I file
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exists and is readable.
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.IP "\fB-s\fR \fIfile\fR"
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True if
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.I file
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exists and has a size greater
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than zero.
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.IP "\fB-t\fR [ \fIfile_descriptor\fR ]"
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True if the file whose file descriptor number
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is
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.I file_descriptor
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(default 1) is open and is
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associated with a terminal.
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.IP "\fB-u\fR \fIfile\fR"
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True if
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.I file
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exists and its set user ID flag
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is set.
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.IP "\fB-w\fR \fIfile\fR"
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True if
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.I file
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exists and is writable.
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True
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indicates only that the write flag is on.
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The file is not writable on a read-only file
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system even if this test indicates true.
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.IP "\fB-x\fR \fIfile\fR"
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True if
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.I file
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exists and is executable.
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True
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indicates only that the execute flag is on.
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If
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.I file
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is a directory, true indicates that
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.I file
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can be searched.
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.IP "\fB-z\fR \fIstring\fR"
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True if the length of
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.I string
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is zero.
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.IP "\fIstring\fR"
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True if
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.I string
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is not the null
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string.
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.IP "\fIs1\fR \fB=\fR \fIs2\fR"
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True if the strings
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.I s1
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and
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.I s2
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are identical.
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.IP "\fIs1\fR \fB!=\fR \fIs2\fR"
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True if the strings
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.I s1
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and
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.I s2
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are not identical.
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.IP "\fIn1\fR \fB-eq\fR \fIn2\fR"
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True if the integers
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.I n1
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and
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.I n2
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are algebraically
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equal.
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.IP "\fIn1\fR \fB-ne\fR \fIn2\fR"
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True if the integers
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.I n1
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and
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.I n2
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are not
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algebraically equal.
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.IP "\fIn1\fR \fB-gt\fR \fIn2\fR"
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True if the integer
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.I n1
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is algebraically
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greater than the integer
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.I n2 .
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.IP "\fIn1\fR \fB-ge\fR \fIn2\fR"
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True if the integer
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.I n1
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is algebraically
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greater than or equal to the integer
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.I n2 .
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.IP "\fIn1\fR \fB-lt\fR \fIn2\fR"
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True if the integer
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.I n1
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is algebraically less
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than the integer
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.I n2 .
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.IP "\fIn1\fR \fB-le\fR \fIn2\fR"
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True if the integer
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.I n1
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is algebraically less
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than or equal to the integer
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.I n2 .
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.LP
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These primaries can be combined with the following operators:
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.IP "\fB!\fR \fIexpression\fR"
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True if
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.I expression
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is false.
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.IP "\fIexpression1\fR \fB-a\fR \fIexpression2\fR"
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True if both
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.I expression1
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and
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.I expression2
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are true.
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.IP "\fIexpression1\fR \fB-o\fR \fIexpression2\fR"
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True if either
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.I expression1
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or
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.I expression2
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are true.
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.IP "\fB\&(\fR \fIexpression\fR \fB\&)\fR"
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True if
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.I expression
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is true.
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.LP
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The
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.B -a
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operator has higher precedence than the
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.B -o
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operator.
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.SH GRAMMAR AMBIGUITY
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The
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.B test
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grammar is inherently ambiguous. In order to assure a degree of consistency,
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the cases described in the
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.IR "POSIX 1003.2" ,
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section D11.2/4.62.4, standard
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are evaluated consistently according to the rules specified in the
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standards document. All other cases are subject to the ambiguity in the
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command semantics.
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.SH GNO CAVEATS
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The
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.BR \-b ,
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.BR \-c ,
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.BR \-g ,
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and
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.BR \-u
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operators always cause a false return value (as of GNO v2.0.4)
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since block- and character-special files, and the setuid and setgid bits
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are not currently available under GS/OS.
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.LP
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Because of the implementation of
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.BR stat (2)
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under GNO v2.0.4, the
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.BR \-x
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operator will return false if
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.I file
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is a directory.
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.SH RETURN VALUES
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The
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.B test
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utility exits with one of the following values:
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.IP \fB0\fR
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.I expression
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evaluated to true.
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.IP \fB1\fR
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.I expression
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evaluated to false or expression was missing.
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.IP \fB>1\fR
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An error occurred.
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.SH AUTHOR
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This code is derived from software contributed to Berkeley by
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Kenneth Almquist, and is based on BSD
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.BR test
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version 5.4.
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.LP
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The GNO port of
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.BR test
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was done by Devin Reade, <gdr@gno.org>.
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.SH STANDARDS
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The
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.B test
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function is expected to be
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.I "POSIX 1003.2"
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compatible.
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