gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method <Extension_UUID>

% ls -og  /usr/share/gnome-shell/extensions
total 4
drwxr-xr-x 2 4096 Mär 31 15:15 GPaste@gnome-shell-extensions.gnome.org

% ls -og ~/.local/share/gnome-shell/extensions/
total 16
drwxrwxr-x 3 4096 Mär 26 08:01 drive-menu@gnome-shell-extensions.gcampax.github.com
drwxrwxr-x 3 4096 Mär 26 08:02 laine@knasher.gmail.com
drwxrwxr-x 4 4096 Mär 26 07:56 user-theme@gnome-shell-extensions.gcampax.github.com
drwxrwxr-x 3 4096 Mär 26 07:57 web_search_dialog@awamper.gmail.com

% less ~/.local/share/gnome-shell/extensions/drive-menu@gnome-shell-extensions.gcampax.github.com/metadata.json
{
  "_generated": "Generated by SweetTooth, do not edit",
  "description": "A status menu for accessing and unmounting removable devices.",
  "extension-id": "drive-menu",
  "gettext-domain": "gnome-shell-extensions",
  "name": "Removable Drive Menu",
  "settings-schema": "org.gnome.shell.extensions.drive-menu",
  "shell-version": [
    "3.16"
  ],
  "url": "http://git.gnome.org/gnome-shell-extensions",
  "uuid": "drive-menu@gnome-shell-extensions.gcampax.github.com",
  "version": 28
}

gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Extensions.ReloadExtension "drive-menu@gnome-shell-extensions.gcampax.github.com"

sudo apt-get install jq

jq '.uuid' ~/.local/share/gnome-shell/extensions/<shell_extension_path>/metadata.json

% jq '.uuid' ~/.local/share/gnome-shell/extensions/drive-menu@gnome-shell-extensions.gcampax.github.com/metadata.json
"drive-menu@gnome-shell-extensions.gcampax.github.com"

gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Extensions.ReloadExtension  $(jq '.uuid' ~/.local/share/gnome-shell/extensions/drive-menu@gnome-shell-extensions.gcampax.github.com/metadata.json)