> The `run` command was [introduced](https://gitlab.com/gitlab-org/gitlab/merge_requests/4466) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 10.6. [Moved](https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/24780) to [GitLab Core](https://about.gitlab.com/pricing/) in 11.9.
Slash commands in Mattermost and Slack allow you to control GitLab and view GitLab content right inside your chat client, without having to leave it. For Slack, this requires a [project service configuration](../user/project/integrations/slack_slash_commands.md). Simply type the command as a message in your chat client to activate it.
Note that if you are using the [GitLab Slack application](../user/project/integrations/gitlab_slack_application.md) for
your GitLab.com projects, you need to [add the `gitlab` keyword at the beginning of the command](../user/project/integrations/gitlab_slack_application.md#usage).