I was trying to install an APK file generated by an android build. I was using Galaxy S5. I plugged the phone in via USB to my computer but adb was unable to detect the device.
$ adb devices
List of devices attached
What do I do to make this phone visible to adb? The reason why I want to use adb is this is how you install android apps onto devices. In the past you just had to select the option to enable usb debugging but in recent version of android this feature is not readily available.
I found the solution finally.
adb devices
in the command line and the phone will be visible