.\" Copyright (c) 1991 Regents of the University of California. .\" All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" the Institute of Electrical and Electronics Engineers, Inc. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)test.1 6.6 (Berkeley) 6/8/92 .\" .\" $Id: test.1,v 1.2 1997/10/30 03:35:21 gdr Exp $ .\" .TH TEST 1 "19 October 1997" GNO "Commands and Applications" .SH NAME test \- Condition evaluation utility. .SH SYNOPSIS .B test .I expression .SH DESCRIPTION The .B test utility evaluates the expression and, if it evaluates to true, returns a zero (true) exit status; otherwise it returns 1 (false). If there is no expression, test also returns 1 (false). .LP All operators and flags are separate arguments to the .B test utility. .LP The following primaries are used to construct .IR expression : .IP "\fB-b\fR \fIfile\fR" True if .I file exists and is a block special file. .IP "\fB-c\fR \fIfile\fR" True if .I file exists and is a character special file. .IP "\fB-d\fR \fIfile\fR" True if .I file exists and is a directory. .IP "\fB-e\fR \fIfile\fR" True if .I file exists (regardless of type). .IP "\fB-f\fR \fIfile\fR" True if .I file exists and is a regular file. .IP "\fB-g\fR \fIfile\fR" True if .I file exists and its set group ID flag is set. .IP "\fB-n\fR \fIstring\fR" True if the length of .I string is nonzero. .IP "\fB-p\fR \fIfile\fR" True if .I file is a named pipe (FIFO). .IP "\fB-r\fR \fIfile\fR" True if .I file exists and is readable. .IP "\fB-s\fR \fIfile\fR" True if .I file exists and has a size greater than zero. .IP "\fB-t\fR [ \fIfile_descriptor\fR ]" True if the file whose file descriptor number is .I file_descriptor (default 1) is open and is associated with a terminal. .IP "\fB-u\fR \fIfile\fR" True if .I file exists and its set user ID flag is set. .IP "\fB-w\fR \fIfile\fR" True if .I file exists and is writable. True indicates only that the write flag is on. The file is not writable on a read-only file system even if this test indicates true. .IP "\fB-x\fR \fIfile\fR" True if .I file exists and is executable. True indicates only that the execute flag is on. If .I file is a directory, true indicates that .I file can be searched. .IP "\fB-z\fR \fIstring\fR" True if the length of .I string is zero. .IP "\fIstring\fR" True if .I string is not the null string. .IP "\fIs1\fR \fB=\fR \fIs2\fR" True if the strings .I s1 and .I s2 are identical. .IP "\fIs1\fR \fB!=\fR \fIs2\fR" True if the strings .I s1 and .I s2 are not identical. .IP "\fIn1\fR \fB-eq\fR \fIn2\fR" True if the integers .I n1 and .I n2 are algebraically equal. .IP "\fIn1\fR \fB-ne\fR \fIn2\fR" True if the integers .I n1 and .I n2 are not algebraically equal. .IP "\fIn1\fR \fB-gt\fR \fIn2\fR" True if the integer .I n1 is algebraically greater than the integer .I n2 . .IP "\fIn1\fR \fB-ge\fR \fIn2\fR" True if the integer .I n1 is algebraically greater than or equal to the integer .I n2 . .IP "\fIn1\fR \fB-lt\fR \fIn2\fR" True if the integer .I n1 is algebraically less than the integer .I n2 . .IP "\fIn1\fR \fB-le\fR \fIn2\fR" True if the integer .I n1 is algebraically less than or equal to the integer .I n2 . .LP These primaries can be combined with the following operators: .IP "\fB!\fR \fIexpression\fR" True if .I expression is false. .IP "\fIexpression1\fR \fB-a\fR \fIexpression2\fR" True if both .I expression1 and .I expression2 are true. .IP "\fIexpression1\fR \fB-o\fR \fIexpression2\fR" True if either .I expression1 or .I expression2 are true. .IP "\fB\&(\fR \fIexpression\fR \fB\&)\fR" True if .I expression is true. .LP The .B -a operator has higher precedence than the .B -o operator. .SH GRAMMAR AMBIGUITY The .B test grammar is inherently ambiguous. In order to assure a degree of consistency, the cases described in the .IR "POSIX 1003.2" , section D11.2/4.62.4, standard are evaluated consistently according to the rules specified in the standards document. All other cases are subject to the ambiguity in the command semantics. .SH GNO CAVEATS The .BR \-b , .BR \-c , .BR \-g , and .BR \-u operators always cause a false return value (as of GNO v2.0.4) since block- and character-special files, and the setuid and setgid bits are not currently available under GS/OS. .LP Because of the implementation of .BR stat (2) under GNO v2.0.4, the .BR \-x operator will return false if .I file is a directory. .SH RETURN VALUES The .B test utility exits with one of the following values: .IP \fB0\fR .I expression evaluated to true. .IP \fB1\fR .I expression evaluated to false or expression was missing. .IP \fB>1\fR An error occurred. .SH AUTHOR This code is derived from software contributed to Berkeley by Kenneth Almquist, and is based on BSD .BR test version 5.4. .LP The GNO port of .BR test was done by Devin Reade, . .SH STANDARDS The .B test function is expected to be .I "POSIX 1003.2" compatible.