TEST(C) XENIX System V TEST(C)
Name
test - Tests conditions.
Syntax
test expr
[expr]
Description
test evaluates the expression expr, and if its value is
true, returns a zero (true) exit status; otherwise, test
returns a nonzero exit status if there are no arguments.
The following primitives are used to construct expr:
-r file True if file exists and is readable.
-w file True if file exists and is writable.
-x file True if file exists and is executable.
-f file True if file exists and is a regular file.
-d file True if file exists and is a directory.
-c file True if file exists and is a character special
file.
-b file True if file exists and is a block special
file.
-u file True if file exists and its set-user-ID bit is
set.
-g file True if file exists and its set-group-ID bit is
set.
-k file True if file exists and its sticky bit is set.
-s file True if file 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.
Possible null length strings must be enclosed
in double quotation marks (").
-n s1 True if the length of string s1 is nonzero.
Possible null length strings must be enclosed
in double quotation marks (").
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TEST(C) XENIX System V TEST(C)
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 -eqn2 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.
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)
(expr) Parentheses for grouping
Notice that all the operators and flags are separate
arguments to test. Notice also, that parentheses are
meaningful to the shell and, therefore, must be escaped.
See Also
find(C), sh(C)
Warning
In the second form of the command (that is, the one that
uses [], rather than the word test), the square brackets
must be delimited by blanks. That form of the command also
requires that the expression s1 = s2 contain a space on each
side of the ``='' and s1 != s2 contain a space before the
``!'' and after the ``=''.
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