Checks the integrity of the file and generates a report of any
    errors in its structure. The report produced by the /CHECK
    qualifier includes a list of any errors and a summary of the
    file's structure. If you do not specify an output file, the
    report is written to the current SYS$OUTPUT device, which is
    generally your terminal. You can use wildcards and multiple file
    specifications. If you specify /NOOUTPUT, you only get a message
    indicating whether the file has errors.

    The check function is active by default when you use the ANALYZE
    /RMS_FILE command without any qualifiers. The /CHECK qualifier
    is not compatible with the /FDL qualifier, the /INTERACTIVE
    qualifier, the /STATISTICS qualifier, or the /SUMMARY qualifier.
    If /CHECK is used with any of the other qualifiers, /FDL takes
    precedence, next is /INTERACTIVE, then /STATISTICS, and lastly
    /SUMMARY.