I have successfully installed Ionic. In fact, I have ran it many times already and it worked perfectly fine (on my browser using "ionic serve" command).. But when I have not done "Ionic stuffs" for a few days, and tried doing it this morning, the command is now unrecognized. What is wrong with this?
Running Windows 7 and ran into this issue myself. I ensured that I was running my command line as Administrator, cleaned the cache as suggested but continued to get the error that 'ionic' is not recognized...
After trying several other suggestions, I finally browsed to my nodejs location: C:\Program Files\nodejs
I ran the nodevars.bat to open the nodejs command prompt, ran the ionic command and everything worked as expected. I'm not sure what the issue is but running command from that .bat file appears to fix it.
I already solved it. :) For some unknown reason my ionic installation went MIA. And I didn't solve that directly, it had errors that says "Run as Administrator", etc when in fact I'm running Admin... The trick was to clean the cache before reinstalling Ionic using the npm cache clean command.