is there a way to run the emulator without starting the Android Studio first. Perhaps from the command line. I know that this feature was available in older versions and has vanished since then. But perhaps someone found out how to do it anyways?
The way to run the emulator from the console (I assume that you installed it before, using Android Studio) is:
run
cd ~/Android/Sdk/tools/bin && ./avdmanager list avd
OR
cd ~/Android/Sdk/tools && ./emulator -list-avds
You will get the list od your virtual installed devices. In my case it was:
Available Android Virtual Devices:
Name: Galaxy_Nexus_API_17
Device: Galaxy Nexus (Google)
Path: /home/piotr/.android/avd/Galaxy_Nexus_API_17.avd
Target: Google APIs (Google Inc.)
Based on: Android 4.2 (Jelly Bean) Tag/ABI: google_apis/x86
Skin: galaxy_nexus
Sdcard: /home/piotr/.android/avd/Galaxy_Nexus_API_17.avd/sdcard.img
Copy name of the device you want to run and then
cd ~/Android/Sdk/tools && ./emulator -avd NAME_OF_YOUR_DEVICE
in my case:
cd ~/Android/Sdk/tools && ./emulator -avd Nexus_5X_API_23