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variables.md: environment variable default from a file #519

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variables.md: environment variable default from a file #519

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6 changes: 6 additions & 0 deletions cmdline/variables.md
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Expand Up @@ -81,6 +81,12 @@ Instead, let's use `dummy` as a default value if `%USER` does not exist:
--variable %USER=dummy \
--expand-url "https://example.com/api/{{USER}}/method"

Or get the default contents from a local file:

curl \
--variable %USER@file \
--expand-url "https://example.com/api/{{USER}}/method"

## Expand `--variable`

The `--variable` option itself can also be expanded, which allows you to
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