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BSD 2.11 - man page for test (bsd section 1)

TEST(1) 				       General Commands Manual					      TEST(1)

NAME
test - condition evaluation utility
SYNOPSIS
test expression
DESCRIPTION
The 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). All operators and flags are separate arguments to the test utility. The following primaries are used to construct expression: -b file True if file exists and is a block special file. -c file True if file exists and is a character special file. -d file True if file exists and is a directory. -e file True if file exists (regardless of type). -f file True if file exists and is a regular file. -g file True if file exists and its set group ID flag is set. -h file True if file exists and is a symbolic link. -n string True if the length of string is nonzero. -p file True if file is a named pipe -r file True if file exists and is readable. -s file True if file exists and has a size greater than zero. -t [file_descriptor] True if the file whose file descriptor number is file_descriptor (default 1) is open and is associated with a terminal. -u file True if file exists and its set user ID flag is set. -w file True if 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. -x file True if file exists and is executable. True indicates only that the execute flag is on. If file is a directory, true indicates that file can be searched. -z string True if the length of string is zero. string True if string is not the null string. s1 = s2 True if the strings s1 and s2 are identical. s1 != s2 True if the strings s1 and s2 are not identical. n1 -eq n2 True if the integers n1 and n2 are algebraically equal. n1 -ne n2 True if the integers n1 and n2 are not algebraically equal. n1 -gt n2 True if the integer n1 is algebraically greater than the integer n2 . n1 -ge n2 True if the integer n1 is algebraically greater than or equal to the integer n2 . n1 -lt n2 True if the integer n1 is algebraically less than the integer n2 . n1 -le n2 True if the integer n1 is algebraically less than or equal to the integer n2 . These primaries can be combined with the following operators: ! expression True if expression is false. expression1 -a expression2 True if both expression1 and expression2 are true. expression1 -o expression2 True if either expression1 or expression2 are true. (expression) True if expression is true. The -a operator has higher precedence than the -o operator.
GRAMMAR AMBIGUITY
The 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 seman- tics.
RETURN VALUES
The test utility exits with one of the following values: 0 expression evaluated to true. 1 expression evaluated to false or expression was missing. >1 An error occurred.
BUGS
Named pipes are not implemented in 2.11BSD.
STANDARDS
The test function is expected to be IEEE Std 1003.2 ("POSIX") compatible. 7th Edition March 13, 1995 TEST(1)


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