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Martin Mosegaard Amdisen 09476ca3f7 Fix plural typo in 'save' command help

The form "Save an images" is not correct.
Either "Save an image" or "Save images" work, but since
the save commands accepts multiple images, I chose the
latter.

Fixed in all places where I could grep "Save an image(s)".

Signed-off-by: Martin Mosegaard Amdisen <martin.amdisen@praqma.com>
Upstream-commit: 315c34a25a
Component: cli

2017-06-02 00:07:32 +00:00

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save

Usage: docker save [OPTIONS] IMAGE [IMAGE...]

Save images to a tar archive (streamed to STDOUT by default)

  --help             Print usage
  -o, --output=""    Write to a file, instead of STDOUT

Produces a tarred repository to the standard output stream. Contains all parent layers, and all tags + versions, or specified repo:tag, for each argument provided.

It is used to create a backup that can then be used with docker load

$ docker save busybox > busybox.tar
$ ls -sh busybox.tar
2.7M busybox.tar
$ docker save --output busybox.tar busybox
$ ls -sh busybox.tar
2.7M busybox.tar
$ docker save -o fedora-all.tar fedora
$ docker save -o fedora-latest.tar fedora:latest

It is even useful to cherry-pick particular tags of an image repository

$ docker save -o ubuntu.tar ubuntu:lucid ubuntu:saucy

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save

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