The mktemp is useful for creating temporary files.

When creating scripts with mktemp, be mindful about the different implementations, specially if your intention is to run your script in a container.

The Alpine Linux (a very common distro in the Docker ecosystem) uses a simplified version of mktemp. Then, consider these caveats:

• don't use --long-options (it may work in your favorite distro, but not in Alpine)
• if you specify the template for the file name:
  • use exactly 6 Xs, like this: <name>-XXXXXX
  • the 6 Xs MUST come at the end of the template (therefore you can't specify a file extension)