docker inspect --format='{{json .Config.Env}}' container_name
…returns a JSON array:
[
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/share/npm-global/bin",
"NODE_VERSION=12.16.3",
"YARN_VERSION=1.22.4",
"NVM_DIR=/usr/local/share/nvm"
]
To find out what data can be printed, show all content as JSON. . represents the context:
docker inspect --format='{{json .}}' container_name
docker inspect --format='{{json .HostConfig.Binds}}' container_name
docker inspect --format='{{.NetworkSettings.IPAddress}}' container_name
Template modifiers
join
join concatenates a list of strings to create a single string. It puts a separator between each element in the list.
docker inspect --format '{{join .Args " , "}}' container
table
table specifies which fields you want to see its output.
docker image list --format "table {{.ID}}\t{{.Repository}}\t{{.Tag}}\t{{.Size}}"
json
json encodes an element as a json string.
docker inspect --format '{{json .Mounts}}' container
lower
lower transforms a string into its lowercase 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 .Image ":"}}'
title
title capitalizes the first character of a string.
docker inspect --format "{{title .Name}}" container
upper
upper transforms a string into its uppercase representation.
docker inspect --format "{{upper .Name}}" container
println
println prints each value on a new line.
docker inspect --format='{{range .NetworkSettings.Networks}}{{println .IPAddress}}{{end}}' container