TEST
Section: User Commands (1)
Updated: October 21, 1988
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NAME
test - condition command
SYNOPSIS
test
expr
DESCRIPTION
test
evaluates the expression
expr,
and if its value is true then returns zero exit status; otherwise, a
nonzero exit status is returned.
test
returns a nonzero exit if there are no arguments.
The following primitives are used to construct
expr.
- -r file
-
true if the file exists and is readable.
- -w file
-
true if the file exists and is writable.
- -f file
-
true if the file exists and is not a directory.
- -d file
-
true if the file exists and is a directory.
- -s file
-
true if the file exists and has a size greater than zero.
- -b file
-
true if the file exists and is a block special device.
- -c file
-
true if the file exists and is a character special device.
- -h file
-
true if the file exists and is a symbolic link.
- -g file
-
true if the file exists and has setgid bit set.
- -k file
-
true if the file exists and has sticky bit set.
- -u file
-
true if the file exists and has setuid bit set.
- -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 the string
s1
is zero.
- -n s1
-
true if the length of the string
s1
is nonzero.
- s1 = s2
-
true
if the strings
s1
and
s2
are equal.
- s1 != s2
-
true
if the strings
s1
and
s2
are not equal.
- 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,
or
-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
- ( expr )
-
parentheses for grouping.
-a
has higher precedence than
-o.
Notice that all the operators and flags are separate
arguments to
test.
Notice also that parentheses are meaningful
to the Shell and must be escaped.
SEE ALSO
sh(1), find(1)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
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