Change these lines in each exec files

exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macerb" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macruby" "$@"     
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/mactestrb" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macirb" "$@"        
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macrake" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macrdoc" "$@"
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macri" "$@"
exec "/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macgem" "$@"

to these =>

exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macerb" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macruby" "$@"     
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/mactestrb" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macirb" "$@"        
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macrake" "$@"   
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macrdoc" "$@"
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macri" "$@"
exec "/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macgem" "$@"