test(1) [ultrix man page]
test(1) General Commands Manual test(1) Name test - test conditional expression Syntax test expr [ expr ] Description The command evaluates the expression expr. If the value of expr is true, the command returns a zero exit status; otherwise, it returns a nonzero exit status. The command also returns a nonzero exit status if no arguments are specified. Options The following primitives are used to construct expr: -r file Tests if the file exists and is readable. -w file Tests if the file exists and is writable. -f file Tests if the file exists and is not a directory. -d file Tests if the file exists and is a directory. -s file Tests if the file exists and has a size greater than zero. -t [ fildes ] Tests if the open file, whose file descriptor number is fildes (1 by default), is associated with a terminal device. -z s1 Tests if the length of string s1 is zero. -n s1 Tests if the length of the string s1 is nonzero. s1 = s2 Tests if the strings s1 and s2 are equal. s1 != s2 Tests if the strings s1 and s2 are not equal. s1 Tests if s1 is not the null string. n1 -eq n2 Tests if number1 equals number2. n1 -ge n2 Tests if number1 is greater than or equal to number2. n1 -gt n2 Tests if number1 is greater than number2. n1 -le n2 Tests if number1 is less than or equal to number2. n1 -lt n2 Tests if number1 is less than number2. n1 -ne n2 Tests if number1 is not equal to number2. These primitives can be combined with the following operators: !expr Negates evaluation of expression. expr -a expr Tests logical and of two expressions. expr -o expr Tests logical or of two expressions. ( expr... ) Groups expressions. The -a operator takes precedence over the -o operator. Note that all the operators and flags are separate arguments to Note also that parentheses are meaningful to the Shell and must be escaped. See Also find(1), sh(1), test(1sh5) test(1)
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TEST(1) General Commands Manual TEST(1) NAME
test - set status according to condition SYNOPSIS
test expr DESCRIPTION
Test evaluates the expression expr. If the value is true the exit status is null; otherwise the exit status is non-null. If there are no arguments the exit status is non-null. The following primitives are used to construct expr. -r file True if the file exists (is accessible) and is readable. -w file True if the file exists and is writable. -x file True if the file exists and has execute permission. -e file True if the file exists. -f file True if the file exists and is a plain file. -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. -t fildes True if the open file whose file descriptor number is fildes (1 by default) is the same file as /dev/cons. s1 = s2 True if the strings s1 and s2 are identical. s1 != s2 True if the strings s1 and s2 are not identical. s1 True if s1 is not the null string. (Deprecated.) -n s1 True if the length of string s1 is non-zero. -z s1 True if the length of string s1 is zero. n1 -eq n2 True if the integers n1 and n2 are arithmetically equal. Any of the comparisons -ne, -gt, -ge, -lt, or -le may be used in place of -eq. The (nonstandard) construct -l string, meaning the length of string, may be used in place of an integer. These primaries may be combined with the following operators: ! unary negation operator -o binary or operator -a binary and operator; higher precedence than -o ( expr ) parentheses for grouping. The primitives -b, -u, -g, and -s return false; they are recognized for compatibility with POSIX. Notice that all the operators and flags are separate arguments to test. Notice also that parentheses and equal signs are meaningful to rc and must be enclosed in quotes. EXAMPLES
Test is a dubious way to check for specific character strings: it uses a process to do what an rc(1) match or switch statement can do. The first example is not only inefficient but wrong, because test understands the purported string "-c" as an option. if (test $1 '=' "-c") echo OK # wrong! A better way is if (~ $1 -c) echo OK Test whether is in the current directory. test -f abc -o -d abc SOURCE
/sys/src/cmd/test.c SEE ALSO
rc(1) TEST(1)