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I want to connect a Nikon camera to a Raspberry Pi with entangle installed.

From a remote computer, via wifi and ssh I have access to the RPi.

How can I simply take a photo (and optionally download it to the RPi) from command line?

I only see graphic interface to manage the camera.

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    \$\begingroup\$ Exactly which Nikon camera you intend to use may also be very applicable to your problem. The Nikon D3x000 and D5x00 series don't do many types of tethering particularly well. \$\endgroup\$
    – Michael C
    Commented Mar 23, 2018 at 12:28
  • \$\begingroup\$ I first tried my D600 with USB cable connected to Ubuntu and it worked okay. I also tried an old Coolpix 8800 but it was not detected \$\endgroup\$
    – dstonek
    Commented Mar 23, 2018 at 15:33
  • \$\begingroup\$ But D600 is not detected by RPi (its SD card) \$\endgroup\$
    – dstonek
    Commented Mar 23, 2018 at 15:49
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    \$\begingroup\$ I'm not sure what the appropriate Stack Exchange site would be for working that out (SuperUser?), but the output of lsusb, gphoto2 --auto-detect, ptpcam --list-devices would be useful to figure it out. \$\endgroup\$
    – Peter Taylor
    Commented Mar 23, 2018 at 18:28
  • \$\begingroup\$ @PeterTaylor That's right. Both cards are listed in Nautilus (file browser in Ubuntu) but executing gphoto2 -> Error 'Could not claim the USB device'. This is a question, how you say, for SuperUser. BTW, gphoto2 autodetect does detect Nikon DSC D600. \$\endgroup\$
    – dstonek
    Commented Mar 23, 2018 at 19:22

2 Answers 2

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Reading Entangle's man page, it doesn't appear there are any command line options to control the camera and/or capture images.

Note that the bottom of Entangle's man page suggests to see also gphoto2, which is a fairly full-featured command line interface to interact with and control the camera. gphoto2's man page gives the following example usage:

gphoto2 --capture-image --interval 60 --hook-script /usr/share/doc/gphoto2/test-hook.sh

    Capture one image every 60 seconds from now to eternity. The
    example hook script will be called after each captured image has
    been stored on the computer.
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    \$\begingroup\$ In further evidence, the home page of the website says "It is built on top of libgphoto using GTK-3 for its interface". \$\endgroup\$
    – Peter Taylor
    Commented Mar 23, 2018 at 8:25
  • \$\begingroup\$ Despite I cannot check gphoto2 with my D600 (it is not detected by RPi) I marked the answer as a solution because it is the way to follow. \$\endgroup\$
    – dstonek
    Commented Mar 23, 2018 at 16:01
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Most graphical tethering programs for Linux are GUI wrappers around libgphoto2. The standard command-line interface for libgphoto2 is gphoto2.

The main competitor which I know of is libptp / ptpcam. I have a fork which compiles on my Raspberry Pi and adds an exposure bracketing feature at https://github.com/pjt33/ptpcam-fork

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