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interactive test faulty

From: Tim Dickson
Subject: interactive test faulty
Date: Thu, 22 Mar 2012 12:06:24 +0000
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20120312 Thunderbird/11.0

Bash version 4.1.7(2)
Slackware 13.1.0 (32bit) ( kernel, i686 AMD Athlon II X2 250 processor)
$- does not work as documented
example, from a bash shell
*echo e"$-"*
output is *ehimBH*
put echo "$-" in a oneline bash script called test and make executable
output is *ehB*
this should include the "i" in the output as the shell _is_ interactive
*echo hi|./test *
output is *e*
this is as expected input is not from a tty

either the functionality of bash is not correct or the meaning of interactive is not clear.
eg a script called test2 as follows
echo "type in your name"
echo "hello $USERNAME"

called via the shell by typing

is interactive, but $- special variable doe not indicate it is.

regards, Tim

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