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--help and help are successful commands so output should not go to error. QE teams have requested this change, also users doing docker help | less or docker run --help | less would expect this to work. Usage statement should only be printed when the user asks for it. Errors should print error message and then suggest the docker COMMAND --help command to see usage information. The current behaviour causes the user to have to search for the error message and sometimes scrolls right off the screen. For example a error on a "docker run" command is very difficult to diagnose. Finally erros should always exit with a non 0 exit code, if the user makes a CLI error. Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan) Upstream-commit: 61b129d81802e3c988cc0e67e488b24968dd748a Component: engine
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% DOCKER(1) Docker User Manuals % Docker Community % JUNE 2014
NAME
docker-rmi - Remove one or more images
SYNOPSIS
docker rmi [-f|--force[=false]] [--help] [--no-prune[=false]] IMAGE [IMAGE...]
DESCRIPTION
This will remove one or more images from the host node. This does not remove images from a registry. You cannot remove an image of a running container unless you use the -f option. To see all images on a host use the docker images command.
OPTIONS
-f, --force=true|false Force removal of the image. The default is false.
--help Print usage statement
--no-prune=true|false Do not delete untagged parents. The default is false.
EXAMPLES
Removing an image
Here is an example of removing and image:
docker rmi fedora/httpd
HISTORY
April 2014, Originally compiled by William Henry (whenry at redhat dot com) based on docker.com source material and internal work. June 2014, updated by Sven Dowideit SvenDowideit@home.org.au