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refresh: Indicate that PACKAGE... is optional.
* guix/scripts/refresh.scm (show-help): Add brackets around PACKAGE.
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@ -119,7 +119,7 @@ (define %options
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(show-version-and-exit "guix refresh")))))
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(define (show-help)
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(display (_ "Usage: guix refresh [OPTION]... PACKAGE...
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(display (_ "Usage: guix refresh [OPTION]... [PACKAGE]...
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Update package definitions to match the latest upstream version.
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When PACKAGE... is given, update only the specified packages. Otherwise
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