What this snippet does
Remote ADD does not extract, cannot be checksum-verified inline, and bakes the download into a layer.
Expected output
tar: /tmp/tool.tar.gz: Cannot open: No such file or directory
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 with ownershipCOPY & ADD · intermediate
- Copy from another imageCOPY & ADD · intermediate
- ADD unpacks archivesCOPY & ADD · intermediate
- Copying with a wildcardCOPY & ADD · intermediate