Installing Grails on Linux

I run Linux (Ubuntu 7.10) as my desktop operating system, and it's working out well. However, every time I upgrade Grails I forget to make the script in $GRAILS_HOME/bin executable and get this error:
prule@dev2:~/workspace/film-suggestions-grails$ grails clean
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/groovy/grails/cli/support/GrailsStarter

So, if you find yourself with this cryptic message, it is time to RTFM - the installation instructions actually point out:
If you get an error message, try to chmod +x the grails script inside the bin directory.

When I googled this exception I got unrelated stuff. Hopefully now if you search for this you'll find this post and be up and running fast.

Note:  I experience this problem because I always download the zip distribution. If you get the tar.gz binary, extracting this will preserve the correct file permissions.

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