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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)
