Condition in bash script Post: 303038798

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test

TEST(1) 						      General Commands Manual							   TEST(1)

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 non zero exit status is returned.
       test returns a non zero 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.

       -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 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)

																	   TEST(1)

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