TEST(1)TEST(1)NAMEtest - condition command
SYNOPSIStest expr
DESCRIPTIONtest 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 ALSOsh(1), find(1)7th Edition October 21, 1988 TEST(1)