I tried activating a VirtualEnv through a shell script like the one below but it doesn\'t seem to work,
#!/bin/sh source ~/.virtualenvs/pinax-env/bin/activa
In my case, Ubuntu 16.04, the methods above didn't worked well or it needs much works.
I just made a link of 'activate' script file and copy it to home folder(or $PATH accessible folder) and renamed it simple one like 'actai'.
Then in a terminal, just call 'source actai'. It worked!