Can I update all packages by bash script?

[JaydenFish]

I want to update packages and spacemacs by bash script. click update button is troublesome.
I can update spacemacs by git pull --rebase. But how to update packages by bash script?

[real-or-random]

The button is bound to the function configuration-layer/update-packages, which you can also run via SPC f e U.

If you want to run it from the command line, you should try emacs --funcall=configuration-layer/update-packages. (Or emacs --eval=<expr> if you need a more flexible alternative that takes arbitrary expressions, see man emacs.) I haven't tried this, and I'm not sure if this works. Updating packages is a somewhat involved operation, so something is at odds when you call it from the command line. But it's worth a try, and I agree that it could be convenient after git pull.

[McPhale]

I was able to do that by following this stack exchange post: https://emacs.stackexchange.com/a/45923