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CAP_MKDB(1) BSD General Commands Manual CAP_MKDB(1)
cap_mkdb -- create capability database
cap_mkdb [-b | -l] [-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
The options are as follows:
-b Use big-endian byte order for database metadata.
Specify a different database basename.
-l Use little-endian byte order for database metadata.
-v Print out the number of capability records in the database.
The -b and the -l flags are mutually exclusive. The default byte ordering is the current
The following is a description of the hashed database created by cap_mkdb. For a descrip-
tion of the format of the input files see termcap(5).
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 consisting of a special byte followed by the
rest of the record. The special 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
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 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 June 6, 1993 BSD
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