What this snippet does
--chown sets ownership during the copy, avoiding a second layer that duplicates every file.
Expected output
server listening on 3000
Why practise typing this
Typing copy & add code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Docker practice
- Copy to a directoryCOPY & ADD · beginner
- Copying a directory's contentsCOPY & ADD · intermediate
- Copy from another imageCOPY & ADD · intermediate
- ADD unpacks archivesCOPY & ADD · intermediate
- ADD with a remote URLCOPY & ADD · intermediate
- Copying with a wildcardCOPY & ADD · intermediate