<!--[metadata]> +++ title = "Format command and log output" description = "CLI and log output formatting reference" keywords = ["format, formatting, output, templates, log"] [menu.main] parent = "engine_admin" weight=-90 +++ <![end-metadata]--> # Formatting reference Docker uses [Go templates](https://golang.org/pkg/text/template/) to allow users manipulate the output format of certain commands and log drivers. Each command a driver provides a detailed list of elements they support in their templates: - [Docker Images formatting](https://docs.docker.com/engine/reference/commandline/images/#formatting) - [Docker Inspect formatting](https://docs.docker.com/engine/reference/commandline/inspect/#examples) - [Docker Log Tag formatting](https://docs.docker.com/engine/admin/logging/log_tags/) - [Docker Network Inspect formatting](https://docs.docker.com/engine/reference/commandline/network_inspect/) - [Docker PS formatting](https://docs.docker.com/engine/reference/commandline/ps/#formatting) - [Docker Volume Inspect formatting](https://docs.docker.com/engine/reference/commandline/volume_inspect/) - [Docker Version formatting](https://docs.docker.com/engine/reference/commandline/version/#examples) ## Template functions Docker provides a set of basic functions to manipulate template elements. This is the complete list of the available functions with examples: ### Join Join concatenates a list of strings to create a single string. It puts a separator between each element in the list. $ docker ps --format '{{join .Names " or "}}' ### Json Json encodes an element as a json string. $ docker inspect --format '{{json .Mounts}}' container ### Lower Lower turns a string into its lower case representation. $ docker inspect --format "{{lower .Name}}" container ### Split Split slices a string into a list of strings separated by a separator. # docker inspect --format '{{split (join .Names "/") "/"}}' container ### Title Title capitalizes a string. $ docker inspect --format "{{title .Name}}" container ### Upper Upper turms a string into its upper case representation. $ docker inspect --format "{{upper .Name}}" container