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The prepdeltarpm, writedeltarpm and applydeltarpm binaries are part of the delta
RPM suite (package deltarpm) and help you create and apply delta RPM packages.
With the following commands, create a delta RPM called new.delta.rpm. The following
command assumes that old.rpm and new.rpm are present:
prepdeltarpm -s seq -i info old.rpm > old.cpio
prepdeltarpm -f new.rpm > new.cpio
xdelta delta -0 old.cpio new.cpio delta
writedeltarpm new.rpm delta info new.delta.rpm
Finally, remove the temporary working les old.cpio, new.cpio, and delta.
Using applydeltarpm, you can reconstruct the new RPM from the le system if the
old package is already installed:
applydeltarpm new.delta.rpm new.rpm
To derive it from the old RPM without accessing the le system, use the -r option:
applydeltarpm -r old.rpm new.delta.rpm new.rpm
See /usr/share/doc/packages/deltarpm/README for technical details.
9.2.5 RPM Queries
With the -q option rpm initiates queries, making it possible to inspect an RPM archive
(by adding the option -p) and also to query the RPM database of installed packages.
Several switches are available to specify the type of information required. See Ta-
ble 9.1, “The Most Important RPM Query Options” (page 124).
Table 9.1: The Most Important RPM Query Options
Package information
-i
File list
-l
Query the package that contains the
le
FILE
(the full path must be specied
with
FILE
)
-f FILE
File list with status information (implies
-l)
-s
List only documentation les (implies
-l)
-d
List only conguration les (implies -l)-c
124 Start-Up
136


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