shell:command arg1 arg2 ...
    Run 'command arg1 arg2 ...' in a shell on the device, and return
    its output and error streams. Note that arguments must be separated
    by spaces. If an argument contains a space, it must be quoted with
    double-quotes. Arguments cannot contain double quotes or things
    will go very wrong.

    Note that this is the non-interactive version of "adb shell"

shell:
    Start an interactive shell session on the device. Redirect
    stdin/stdout/stderr as appropriate. Note that the ADB server uses
    this to implement "adb shell", but will also cook the input before
    sending it to the device (see interactive_shell() in commandline.c)

remount:
    Ask adbd to remount the device's filesystem in read-write mode,
    instead of read-only. This is usually necessary before performing
    an "adb sync" or "adb push" request.

    This request may not succeed on certain builds which do not allow
    that.