> What is '$-'?
 
 Read the man page of sh(1):

- (Hyphen) 
 Expands to the current option flags ...

 In the demo "case"-construction the script checks for single character 
options passed to the shell (-script) and if they are within the pattern
"*i*". 

-- 
Markus Illenseer
NetBSD 1.3.2 CD-ROM "Gateway! Vol. 3" now shipping!  See:  http://core.de/