I need a function (or a command line tool?) in a bash script that does the following:

Expands word "[Ss]ome[Ww]ord"
to the following list:
"Someword someword SomeWord someWord"

I.e. it should expand one single word to a list of words using all possible combinations of the letters in each square-bracket pairs in the original word.

There may be any number of square-bracket pairs in the original word, and there may be any number of characters between a square-bracket pair.

Is there maybe a command-line tool that can do just the same?

If you want to learn bash scripting, there is a very good tutorial: Advanced Bash-Scripting Guide

Thanks, it works now, but I am faced with an other problem during the same "project":

When I tried to install hunspell-1.0-RC2 from source on this SuSE 9.1 box, I get these errors:

/usr/lib/gcc-lib/i586-suse-linux/3.3.3/../../../../i586-suse-linux/bin/ld: cannot find -lcurses
collect2: ld returned 1 exit status
make: *** [hunspell] Error 1

I deleted the line "#define CURSES" from hunspell.cxx, so hunspell should not use curses at all. Then why do I get this error?
Besides, I have curses-devel v. 5.4-59 installed, together with all other dependencies of hunspell.

I also made the missing symlink from /lib/libncurses.so.5.4 to /lib/libncurses.so.

There is no configure script for hunspell, so I do not know what to do next...

Probably because the makefile contains the -lcurses directive.