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## environment defaults

  * implement environment variable LICENSECHECK_DEFAULTS


## scripts

  * implement licensefind
    * parse options and arguments like GNU find (or busybox find?)
    * fail on any option supported by find but unsupported here
    * parse new options --licensecheck-*
      and setting=value pairs in env vars LICENSECHECK LICENSECHECK_FIND
    * by default output filenames (i.e. all with any license by default)
  * implement licensegrep
    * parse options and arguments like grep (or busybox/git grep?)
    * fail on any option supported by diff but unsupported here
    * parse new options --licensecheck-*
      and setting=value pairs in env vars LICENSECHECK LICENSECHECK_GREP
    * parse settings from env variables LICENSECHECK LICENSECHECK_GREP
      (treated as fallback for --licensecheck-* options without prefix)
    * by default output verbatim text, with filename prefixed if multiple
  * maybe implement licensegreple
    * like licensegrep, but with syntax matching greple
      <https://metacpan.org/pod/greple>
  * implement licensediff