why can't gpg accept passphrase in the terminal?
Depending on how you invoke GnuPG, it can. It supports a lot of
different ways of providing the passphrase.
The one that might work best for your purposes is to put the passphrase
in a file, passphrase.txt, and then invoke GnuPG like this:
gpg -c --pinentry-mode loopback --passphrase-file passphrase.txt -o
[myfile].tar.zstd.gpg
Why does it need to start a daemon?
Because GnuPG 2.x already starts the daemon. It should be running by
the time you finish logging into your system.
Besides, when I use "gpg -c file", it works fine. I =get asked for
passphrase (via pinentry, I think)
And what do you think launches pinentry?
so I am not sure what you mean by "Where in that command line do you
specify a passphrase"
Really simple. Where in that command line did you specify a passphrase?
You didn't tell GnuPG a passphrase file to use, a passphrase file
descriptor to use, or an actual passphrase to use. So the only thing
GnuPG could do was ask you for one, and that means using gpg-agent to
facilitate the interaction with the user.
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