This clearly states that i need to install SDK Tools, which did add support for the sencha command on my Ubuntu-box. I gave it up after only getting the error message: "[ERROR] The current working directory XXX is not a valid SDK directory. Please 'cd' into a SDK directory before executing this command."
After Googling it, it appears to me that i have to use the Sencha CMD instead, but that does not create the sencha command. No problem as i can find it manually, but why is not the documentation up to date? I would think that at least the first documentation new users visit when starting, should be up to date.