podman/docs/source/markdown/options/file.md

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####> This option file is used in:
####> podman build, farm build
####> If file is edited, make sure the changes
####> are applicable to all of those.
#### **--file**, **-f**=*Containerfile*
Specifies a Containerfile which contains instructions for building the image,
either a local file or an **http** or **https** URL. If more than one
Containerfile is specified, *FROM* instructions are only be accepted from the
last specified file.
If a build context is not specified, and at least one Containerfile is a
local file, the directory in which it resides is used as the build
context.
Specifying the option `-f -` causes the Containerfile contents to be read from stdin.