Shell Programming and Scripting

test=$(basename $i .${i##*.})

   `expr' supports pattern matching and other string operators.  

`STRING : REGEX'
     Perform pattern matching.  The arguments are converted to strings
     and the second is considered to be a (basic, a la GNU `grep')
     regular expression, with a `^' implicitly prepended.  The first
     argument is then matched against this regular expression.

     If the match succeeds and REGEX uses `\(' and `\)', the `:'
     expression returns the part of STRING that matched the
     subexpression.

   `basename' removes any leading directory components from NAME.
Synopsis:

     basename NAME [SUFFIX]

   If SUFFIX is specified and is identical to the end of NAME, it is
removed from NAME as well.

test=${${i##*/}%.*}