portainer/app/components/containerConsole/containerConsole.html

<rd-header>
  <rd-header-title title="Container console">
    <i id="loadingViewSpinner" class="fa fa-cog fa-spin"></i>
  </rd-header-title>
  <rd-header-content ng-if="state.loaded">
    <a ui-sref="containers">Containers</a> &gt; <a ui-sref="container({id: container.Id})">{{ container.Name|trimcontainername }}</a> &gt; Console
  </rd-header-content>
</rd-header>

<div class="row" ng-if="state.loaded">
  <div class="col-lg-12 col-md-12 col-xs-12">
    <rd-widget>
      <rd-widget-header icon="fa-terminal" title="Console">
        <div class="pull-right">
          <i id="loadConsoleSpinner" class="fa fa-cog fa-2x fa-spin" style="margin-top: 5px; display: none;"></i>
        </div>
      </rd-widget-header>
      <rd-widget-body>
        <form class="form-horizontal">
          <div ng-if="!state.connected">
            <!-- command-list -->
              <div class="form-group">
                <label for="command" class="col-lg-1 text-left col-sm-2 control-label">Command</label>
                <div class="col-lg-11 col-sm-10">
                  <div class="input-group" ng-if="!formValues.isCustomCommand">
                    <span class="input-group-addon">
                      <i class="fa fa-linux" aria-hidden="true" ng-if="imageOS == 'linux'"></i>
                      <i class="fa fa-windows" aria-hidden="true" ng-if="imageOS == 'windows'"></i>
                    </span>
                    <select class="form-control" ng-model="formValues.command" id="command">
                      <option value="bash" ng-if="imageOS == 'linux'">/bin/bash</option>
                      <option value="sh" ng-if="imageOS == 'linux'">/bin/sh</option>
                      <option value="powershell" ng-if="imageOS == 'windows'">powershell</option>
                      <option value="cmd.exe" ng-if="imageOS == 'windows'">cmd.exe</option>
                    </select>
                  </div>
                  <input class="form-control" ng-if="formValues.isCustomCommand" type="text" name="custom-command" ng-model="formValues.customCommand" placeholder="e.g. ps aux">
                </div>
              </div>
            <!-- !command-list -->
            <div class="form-group col-lg-12">
              <label for="command" class="text-left control-label">Use custom command</label>
              <label class="switch" style="margin-left: 20px;">
                <input type="checkbox" ng-model="formValues.isCustomCommand"><i></i>
              </label>
            </div>
            <div class="form-group">
              <label for="username" class="col-lg-1 text-left col-sm-2 control-label">
                User
                <portainer-tooltip position="bottom" message="Format is one of: user, user:group, uid or uid:gid"></portainer-tooltip>
              </label>
              <div class="col-lg-11 col-sm-10">
                <input class="form-control" type="text" name="username" ng-model="formValues.user" placeholder="root">
              </div>
            </div>
            <div class="form-group">
              <div class="col-lg-offset-1 col-sm-offset-2 col-lg-11 col-sm-10">
                <button type="button" class="btn btn-primary" ng-click="connect()">Connect</button>
              </div>
            </div>
          </div>
          <div ng-if="state.connected">
            <label>Exec into container as <code>{{ ::formValues.user || 'default user' }}</code> using command <code>{{ formValues.isCustomCommand ? formValues.customCommand : formValues.command }}</code></label>
            <button type="button" class="btn btn-default" ng-click="disconnect()">Disconnect</button>
          </div>
        </form>
      </rd-widget-body>
    </rd-widget>
  </div>
</div>

<div class="row">
  <div class="col-lg-12 col-md-12 col-xs-12">
    <div id="terminal-container" class="terminal-container"></div>
  </div>
</div>