github.com/containers/podman/v5@v5.1.0-rc1/docs/source/markdown/options/file.md (about)

     1  ####> This option file is used in:
     2  ####>   podman build, farm build
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--file**, **-f**=*Containerfile*
     6  
     7  Specifies a Containerfile which contains instructions for building the image,
     8  either a local file or an **http** or **https** URL.  If more than one
     9  Containerfile is specified, *FROM* instructions are only be accepted from the
    10  last specified file.
    11  
    12  If a build context is not specified, and at least one Containerfile is a
    13  local file, the directory in which it resides is used as the build
    14  context.
    15  
    16  Specifying the option `-f -` causes the Containerfile contents to be read from stdin.