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Dan Walsh a2b529ead2 --help option and help command should print to stdout not stderr

--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)

2015-01-06 13:40:14 +01:00

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% DOCKER(1) Docker User Manuals % Docker Community % JUNE 2014

NAME

docker-history - Show the history of an image

SYNOPSIS

docker history [--help] [--no-trunc[=false]] [-q|--quiet[=false]] IMAGE

DESCRIPTION

Show the history of when and how an image was created.

OPTIONS

--help Print usage statement

--no-trunc=true|false Don't truncate output. The default is false.

-q, --quiet=true|false Only show numeric IDs. The default is false.

EXAMPLES

$ sudo docker history fedora
IMAGE          CREATED          CREATED BY                                      SIZE
105182bb5e8b   5 days ago       /bin/sh -c #(nop) ADD file:71356d2ad59aa3119d   372.7 MB
73bd853d2ea5   13 days ago      /bin/sh -c #(nop) MAINTAINER Lokesh Mandvekar   0 B
511136ea3c5a   10 months ago                                                    0 B

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

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