Core Options

All “Core” Scan Options

-n, --processes INTEGER

Scan <input> using n parallel processes. [Default: 1]

--verbose

Print verbose file-by-file progress messages.

--quiet

Do not print summary or progress messages.

--timeout FLOAT

Stop scanning a file if scanning takes longer than a timeout in seconds. [Default: 120]

--reindex-licenses

Force a check and possible reindexing of the cached license index.

--from-json

Load codebase from an existing JSON scan

--max-in-memory INTEGER

Maximum number of files and directories scan details kept in memory during a scan. Additional files and directories scan details above this number are cached on-disk rather than in memory. Use 0 to use unlimited memory and disable on-disk caching. Use -1 to use only on-disk caching. [Default: 10000]

Note

All the Core Options are independent options, i.e. They don’t depend on other options.

Note

For more information on the Scan Command for Various Installation Methods/Operating Systems, refer Installation.

Comparing Progress Message Options

Default Progress Message:

Scanning files for: infos, licenses, copyrights, packages, emails, urls with 1 process(es)...
Building license detection index...Done.
Scanning files...
[####################] 43
Scanning done.
Scan statistics: 43 files scanned in 33s.
Scan options:    infos, licenses, copyrights, packages, emails, urls with 1 process(es).
Scanning speed:  1.4 files per sec.
Scanning time:   30s.
Indexing time:   2s.
Saving results.

Progress Message with ``–verbose``:

Scanning files for: infos, licenses, copyrights, packages, emails, urls with 1 process(es)...
Building license detection index...Done.
Scanning files...
Scanned: screenshot.png
Scanned: README
...
Scanned: zlib/dotzlib/ChecksumImpl.cs
Scanned: zlib/dotzlib/readme.txt
Scanned: zlib/gcc_gvmat64/gvmat64.S
Scanned: zlib/ada/zlib.ads
Scanned: zlib/infback9/infback9.c
Scanned: zlib/infback9/infback9.h
Scanned: arch/zlib.tar.gz
Scanning done.
Scan statistics: 43 files scanned in 29s.
Scan options:    infos, licenses, copyrights, packages, emails, urls with 1 process(es).
Scanning speed:  1.58 files per sec.
Scanning time:   27s.
Indexing time:   2s.
Saving results.

So, with --verbose enables, progress messages for individual files are shown.

With the ``–quiet`` option enabled, nothing is printed on the Command Line.

--timeout Option

This option sets scan timeout for each file (and not the entire scan). If some file scan exceeds the specified timeout, that file isn’t scanned anymore and the next file scanning starts. This helps avoiding very large/long files, and saves time.

Also the number (timeout in seconds) to be followed by this option can be a floating point number, i.e. 1.5467.

--reindex-licenses Option

ScanCode maintains a license index to search for and detect licenses. When Scancode is configured for the first time, a license index is built and used in every scan thereafter.

This --reindex-licenses option rebuilds the license index. Running a scan with this option displays the following message to the terminal in addition to what it normally shows:

Checking and rebuilding the license index...

--from-json Option

If you want to input scan results from a .json file, and run a scan again on those same files, with some other options/output format, you can do so using the --from-json option.

An example scan command using --from-json:

scancode --from-json sample.json --json-pp sample_2.json --classify

This inputs the scan results from sample.json, runs the post-scan plugin --classify and outputs the results for this scan to sample_2.json.

--max-in-memory Option

During a scan, as individual files are scanned, the scan details for those files are kept on memory till the scan is completed. Then after the scan is completed, they are written in the specified output format.

Now, if the scan involves a very large number of files, they might not fit in the memory during the scan. For this reason, disk-caching can be used for some/all of the files.

Some important INTEGER values of the --max-in-memory INTEGER option:

  • 0 - Unlimited Memory, store all the file/directory scan results on memory

  • -1 - Use only Disk-Caching, store all the file/directory scan results on disk

  • 10000 - Default, store 10,000 file/directory scan results on memory and the rest on disk

An example usage:

scancode -clieu --json-pp sample.json samples --max-in-memory -1