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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)
42 lines
1.1 KiB
Markdown
42 lines
1.1 KiB
Markdown
% DOCKER(1) Docker User Manuals
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% Docker Community
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% JUNE 2014
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# NAME
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docker-save - Save an image(s) to a tar archive (streamed to STDOUT by default)
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# SYNOPSIS
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**docker save**
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[**--help**]
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[**-o**|**--output**[=*OUTPUT*]]
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IMAGE [IMAGE...]
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# DESCRIPTION
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Produces a tarred repository to the standard output stream. Contains all
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parent layers, and all tags + versions, or specified repo:tag.
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Stream to a file instead of STDOUT by using **-o**.
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# OPTIONS
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**--help**
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Print usage statement
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**-o**, **--output**=""
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Write to a file, instead of STDOUT
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# EXAMPLES
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Save all fedora repository images to a fedora-all.tar and save the latest
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fedora image to a fedora-latest.tar:
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$ sudo docker save fedora > fedora-all.tar
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$ sudo docker save --output=fedora-latest.tar fedora:latest
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$ ls -sh fedora-all.tar
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721M fedora-all.tar
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$ ls -sh fedora-latest.tar
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367M fedora-latest.tar
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# HISTORY
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April 2014, Originally compiled by William Henry (whenry at redhat dot com)
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based on docker.com source material and internal work.
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June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
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November 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
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