Update README.md
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README.md
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README.md
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@ -104,6 +104,31 @@ Each artifact behaves as a file share. Uploading to the same artifact multiple t
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```
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With the following example, the available artifact (named `artifact` which is the default if no name is provided) would contain both `world.txt` (`hello`) and `extra-file.txt` (`howdy`).
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> **_Warning:_** Be careful when uploading to the same artifact via multiple jobs as artifacts may become corrupted
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```yaml
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strategy:
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matrix:
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node-version: [8.x, 10.x, 12.x, 13.x]
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steps:
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- name: 'Create a file'
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run: echo ${{ matrix.node-version }} > my_file.txt
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- name: 'Accidently upload to the same artifact via multiple jobs'
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uses: 'actions/upload-artifact@v2'
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with:
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name: my-artifact
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path: ${{ github.workspace }}
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```
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In the above example, four jobs will upload four different files to the same artifact but there will only be one file available when `my-artifact` is downloaded. Each job overwrites what was previously uploaded. To ensure that jobs don't overwrite existing artifacts, use a different name per job.
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```yaml
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uses: 'actions/upload-artifact@v2'
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with:
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name: my-artifact ${{ matrix.node-version }}
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path: ${{ github.workspace }}
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```
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### Environment Variables and Tilde Expansion
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You can use `~` in the path input as a substitute for `$HOME`. Basic tilde expansion is supported.
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