Installation guide

multiple entries in the file which override each other, and the behaviour of
such entries can be confusing and difficult to diagnose. Entries that appear
towards the end of the file may not override similar entries that appear at
the beginning. However, if you edit the /etc/sysconfigtab database, you
must run the /sbin/sysconfigdb −s command after you write and quit
the file so that the in-memory copy of the database is updated.
5.3.8.1 Listing Attributes in the Database
To list the entries in the /etc/sysconfigtab database, use the
/sbin/sysconfigdb −l command. If you specify a subsystem name on
the command line, the attributes of that subsystem are listed. Otherwise,
all attributes defined in the database are listed.
For example, to list the attribute settings for the generic subsystem, issue
the following command:
# /sbin/sysconfigdb -l generic
generic:
lockmode = 0
5.3.8.2 Adding Attributes to the Database
To add subsystem attributes to the /etc/sysconfigtab database, enter
the sysconfigdb −a command.
For example, to add the entries stored in a file named add_attrs to the
database, issue the following command:
# /sbin/sysconfigdb -a -f add_attrs generic
5.3.8.3 Merging New Definitions into Existing Database Entries
To merge new definitions for attributes into an existing entry in the
/etc/sysconfigtab database, enter the sysconfigdb −m command.
The sysconfigdb command merges the new definitions into the existing
database entry as follows:
• If an attribute name does not appear in the database, the definition for
that attribute is added to the database.
• If an attribute name does appear, the attribute receives the value
specified by the new definition.
• If an attribute appears in the database, but is not included among the
new definitions, its definition is maintained in the database.
For example, suppose that the following entry for the generic subsystem
exists in the /etc/sysconfigtab database:
5–14 Configuring the Kernel