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- Move /engine/admin/ and /engine/userguide/ topics to /config/ and /develop/ - Get rid of some stub topics that are no longer needed - Rename /engine/article-img/ to /engine/images/ - Mark ambassador linking topic as obsolete - Flesh out multistage build topic - Reorganize some terribly obsolete content in other files
65 lines
1.6 KiB
Markdown
65 lines
1.6 KiB
Markdown
---
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description: CLI and log output formatting reference
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keywords: format, formatting, output, templates, log
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title: Format command and log output
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redirect_from:
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- /engine/admin/formatting/
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---
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Docker uses [Go templates](https://golang.org/pkg/text/template/) which you can
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use to manipulate the output format of certain commands and log drivers.
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Docker provides a set of basic functions to manipulate template elements.
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All of these examples use the `docker inspect` command, but many other CLI
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commands have a `--format` flag, and many of the CLI command references
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include examples of customizing the output format.
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## join
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`join` concatenates a list of strings to create a single string.
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It puts a separator between each element in the list.
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{% raw %}
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$ docker inspect --format '{{join .Args " , "}}' container
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{% endraw %}
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## json
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`json` encodes an element as a json string.
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{% raw %}
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$ docker inspect --format '{{json .Mounts}}' container
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{% endraw %}
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## lower
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`lower` transforms a string into its lowercase representation.
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{% raw %}
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$ docker inspect --format "{{lower .Name}}" container
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{% endraw %}
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## split
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`split` slices a string into a list of strings separated by a separator.
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{% raw %}
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$ docker inspect --format '{{split (join .Names "/") "/"}}' container
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{% endraw %}
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## title
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`title` capitalizes the first character of a string.
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{% raw %}
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$ docker inspect --format "{{title .Name}}" container
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{% endraw %}
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## upper
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`upper` transforms a string into its uppercase representation.
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{% raw %}
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$ docker inspect --format "{{upper .Name}}" container
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{% endraw %}
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