packer-cn/website/content/partials/from-1.5/variables/assignment.mdx

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## Assigning Values to build Variables
Once a variable is declared in your configuration, you can set it:
- Individually, with the `-var foo=bar` command line option.
- In variable definitions (`.pkrvars.hcl` and `.auto.pkrvars.hcl`) files,
either specified on the command line or automatically loaded.
- As environment variables, for example: `PKR_VAR_foo=bar`