CAP_MKDB man page on 4.4BSD

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CAP_MKDB(1)		  BSD General Commands Manual		   CAP_MKDB(1)

     cap_mkdb — create capability database

     cap_mkdb [-v] [-f outfile] file1 [file2 ...]

     Cap_mkdb builds a hashed database out of the getcap(3) logical database
     constructed by the concatenation of the specified files .

     The database is named by the basename of the first file argument and the
     string “.db”.  The getcap(3) routines can access the database in this
     form much more quickly than they can the original text file(s).

     The ``tc'' capabilities of the records are expanded before the record is
     stored into the database.

     The options as as follows:

     -f outfile
	     Specify a different database basename.

     -v	     Print out the number of capability records in the database.

     Each record is stored in the database using two different types of keys.

     The first type is a key which consists of the first capability of the
     record (not including the trailing colon (``:'')) with a data field con‐
     sisting of a special byte followed by the rest of the record.  The spe‐
     cial byte is either a 0 or 1, where a 0 means that the record is okay,
     and a 1 means that there was a ``tc'' capability in the record that
     couldn't be expanded.

     The second type is a key which consists of one of the names from the
     first capability of the record with a data field consisting a special
     byte followed by the the first capability of the record.  The special
     byte is a 2.

     In normal operation names are looked up in the database, resulting in a
     key/data pair of the second type.	The data field of this key/data pair
     is used to look up a key/data pair of the first type which has the real
     data associated with the name.

     The cap_mkdb utility exits 0 on success and >0 if an error occurs.

     dbopen(3), getcap(3), termcap(5)

BSD			       October 27, 2021				   BSD

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