echo command in rails

Hi,

    I am following the instructions given in the link
"http://mutoumahendra.blogspot.com/2010/07/tinymceplugins-spellchecker-on-rails.html"
for doing spell check.

    The problem I am facing here is, I am not able to run
`echo "#{spell_check_text}" | aspell -a -l #{lang}` command while
executing command. When I execute the method the above command is
returning blank.

My question is How to run echo "statement" in rails.

In command prompt I am able to run the echo using exec 'echo blah blah'.

Cheers,
Rana.