Copy file from host machine to docker container

The docker cp utility copies the contents of SRC_PATH to the DEST_PATH. You can copy from the container’s file system to the local machine or the reverse, from the local filesystem to the container. If - is specified for either the SRC_PATH or DEST_PATH, you can also stream a tar archive from STDIN or to STDOUT. The CONTAINER can be a running or stopped container. The SRC_PATH or DEST_PATH can be a file or directory.

Usage: docker cp [OPTIONS] CONTAINER:SRC_PATH DEST_PATH | -
       docker cp [OPTIONS] SRC_PATH | - CONTAINER:DEST_PATH

Copy files/folders between a container and the local filesystem

  -L, --follow-link          Always follow symbol link in SRC_PATH
  --help                     Print usage

For example:

docker cp foo.txt mycontainer:/foo.txt
docker cp mycontainer:/foo.txt foo.txt

Reference: Docker CLI docs for cp