Groovysh loads ok in the xterm. If I attempt to do anything at the groovysh (enter key, help, any command), there is no response. Ctrl-C will exit the groovysh and then the bash shell will attempt to execute the command entered as a shell command.
I have the readline library installed in cygwin. Behavior was the same whether I used groovy 1.5.4 installed manually from the binary.zip file or whether I used the windows native installer. Groovysh does work properly in a windows cmd.exe window.