Solved! I should have read man bash pages! Options are one of the Arguments. test arg1 arg2 arg3 ...... So, $test -n<CR> or $test -z<CR> is just like $test abc<CR>. -n, -z, or abc is handled as arg1 and as 'a string'. Then test deos not think that -z or -n is an option statement. The arg1 (-z or -a or -*) can be considered option only if test has arg2. Without arg2, -z or -n or -* should be handled just like abc. 1 argument The expression is true if and only if the argument is not null. Then $test -*;echo$? returns 0(true) and $test "";echo$? returns 1(false). And in case of no argment which is just $test<CR>, man bash says 0 argment - The expression is false. am i right?? """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" +---------+ * Get your own Jmail account.|URL= http://www.jmail.co.jp |--jmail--| * Get your own home page.|URL= http://www.servance.jp +---------+ * Get your own domain.|URL= http://domaintorou.com/ """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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