TEST(1B) BSD Compatibility Package Commands TEST(1B)


NAME


test - condition evaluation command

SYNOPSIS


/usr/ucb/test expression


expression


DESCRIPTION


test evaluates the expression expression and, if its value is true, sets
0 (true) exit status; otherwise, a non-zero (false) exit status is set.
test also sets a non-zero exit status if there are no arguments. When
permissions are tested, the effective user ID of the process is used.


All operators, flags, and brackets (brackets used as shown in the second
SYNOPSIS line) must be separate arguments to the test command; normally
these items are separated by spaces.

USAGE


Primitives


The following primitives are used to construct expression:

-r filename
True if filename exists and is readable.


-w filename
True if filename exists and is writable.


-x filename
True if filename exists and is executable.


-f filename
True if filename exists and is a regular file.
Alternatively, if /usr/bin/sh users specify /usr/ucb
before /usr/bin in their PATH environment variable, then
test will return true if filename exists and is
(not-a-directory). This is also the default for
/usr/bin/csh users.


-d filename
True if filename exists and is a directory.


-c filename
True if filename exists and is a character special file.


-b filename
True if filename exists and is a block special file.


-p filename
True if filename exists and is a named pipe (fifo).


-u filename
True if filename exists and its set-user- ID bit is set.


-g filename
True if filename exists and its set-group- ID bit is set.


-k filename
True if filename exists and its sticky bit is set.


-s filename
True if filename exists and has a size greater than zero.


-t[ fildes ]
True if the open file whose file descriptor number is
fildes (1 by default) is associated with a terminal
device.


-z s1
True if the length of string s1 is zero.


-n s1
True if the length of the string s1 is non-zero.


s1 = s2
True if strings s1 and s2 are identical.


s1 != s2
True if strings s1 and s2 are not identical.


s1
True if s1 is not the null string.


n1 -eq n2
True if the integers n1 and n2 are algebraically equal.
Any of the comparisons -ne, -gt, -ge, -lt, and -le may be
used in place of -eq.


Operators


These primaries may be combined with the following operators:

!
Unary negation operator.


-a
Binary and operator.


-o
Binary or operator (-a has higher precedence than -o).


(expression)
Parentheses for grouping. Notice also that parentheses
are meaningful to the shell and, therefore, must be
quoted.


SEE ALSO


find(1), sh(1), attributes(7)

NOTES


The not-a-directory alternative to the -f option is a transition aid for
BSD applications and may not be supported in future releases.


If you test a file you own (the -r , -w , or -x tests), but the
permission tested does not have the owner bit set, a non-zero (false)
exit status will be returned even though the file may have the group or
other bit set for that permission. The correct exit status will be set if
you are super-user.


The = and != operators have a higher precedence than the -r through -n
operators, and = and != always expect arguments; therefore, = and !=
cannot be used with the -r through -n operators.


If more than one argument follows the -r through -n operators, only the
first argument is examined; the others are ignored, unless a -a or a -o
is the second argument.


April 1, 1996 TEST(1B)