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.\"     @(#)test.1	8.1.2 (2.11BSD) 1995/03/13
.\"	test.1,v 1.2 1994/09/24 02:59:14 davidg Exp
.\"
.TH TEST 1 "March 13, 1995"
.AT 3
.SH NAME
test \- condition evaluation utility
.SH SYNOPSIS
.B test
.I expression
.SH DESCRIPTION
The
.I 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).
.PP
All operators and flags are separate arguments to the
.I test
utility.
.PP
The following primaries are used to construct expression:
.TP
\fB \-b \fP \fI file \fP
True if
.I file
exists and is a block special
file.
.TP
\fB \-c \fP \fI file \fP
True if
.I file
exists and is a character
special file.
.TP
\fB \-d \fP \fI file \fP
True if
.I file
exists and is a directory.
.TP
\fB \-e \fP \fI file \fP
True if
.I file
exists (regardless of type).
.TP
\fB \-f \fP \fI file \fP
True if
.I file
exists and is a regular file.
.TP
\fB \-g \fP \fI file \fP
True if
.I file
exists and its set group ID flag
is set.
.TP
\fB \-h \fP \fI file \fP
True if
.I file
exists and is a symbolic link.
.TP
\fB \-n \fP \fI string \fP
True if the length of
.I string
is nonzero.
.TP
\fB \-p \fP \fI file \fP
True if
.I file
is a named pipe
.Po Tn FIFO Pc .
.TP
\fB \-r \fP \fI file \fP
True if
.I file 
exists and is readable.
.TP
\fB \-s \fP \fI file \fP
True if
.I file
exists and has a size greater
than zero.
.TP
\fB \-t \fp \fI [file_descriptor] \fP
True if the file whose file descriptor number
is
.I file_descriptor
(default 1) is open and is
associated with a terminal.
.TP
\fB \-u \fP \fI file \fP
True if
.I file
exists and its set user ID flag
is set.
.TP
\fB \-w \fP \fI file \fP
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.
.TP
\fB \-x \fP \fI file \fP
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.
.TP
\fB \-z \fP \fI string \fP
True if the length of
.I string
is zero.
.TP
\fI string \fP
True if
.I string
is not the null
string.
.TP
\fI s1 \fP \fB = \fP \fI s2 \fP
True if the strings
.I s1
and
.I s2
are identical.
.TP
\fI s1 \fP \fB != \fP \fI s2 \fP
True if the strings
.I s1
and
.I s2
are not identical.
.TP
\fI n1 \fP \fB \-eq \fP \fI n2 \fP
True if the integers
.I n1
and
.I n2
are algebraically
equal.
.TP
\fI n1 \fP \fB \-ne \fP \fI n2 \fP
True if the integers
.I n1
and
.I n2
are not
algebraically equal.
.TP
\fI n1 \fP \fB \-gt \fP \fI n2 \fP
True if the integer
.I n1
is algebraically
greater than the integer
.I n2 .
.TP
\fI n1 \fP \fB \-ge \fP \fI n2 \fP
True if the integer
.I n1
is algebraically
greater than or equal to the integer
.I n2 .
.TP
\fI n1 \fP \fB \-lt \fP \fI n2 \fP
True if the integer
.I n1
is algebraically less
than the integer
.I n2 .
.TP
\fI n1 \fP \fB \-le \fP \fI n2 \fP
True if the integer
.I n1
is algebraically less
than or equal to the integer
.I n2 .
.TP
.PP
These primaries can be combined with the following operators:
.TP
.B ! expression
True if
.I expression
is false.
.TP
\fI expression1 \fP \fB \-a \fP \fI expression2 \fP
True if both
.I expression1
and
.I expression2
are true.
.TP
\fI expression1 \fP \fB \-o \fP \fI expression2 \fP
True if either
.I expression1
or
.I expression2
are true.
.TP
\fI (expression) \fP
True if expression is true.
.TP
.PP
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 
IEEE Std 1003.2 ("POSIX"), 
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 RETURN VALUES
The
.B test
utility exits with one of the following values:
.TP
.B 0
expression evaluated to true.
.TP
.B 1
expression evaluated to false or expression was
missing.
.TP
.B >1
An error occurred.
.SH BUGS
Named pipes are not implemented in 2.11BSD.
.SH STANDARDS
The
.B test
function is expected to be
IEEE Std 1003.2 ("POSIX")
compatible.