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The search service can find package by either name (apache), provides(webserver), absolute file names (/usr/bin/apache), binaries (gprof) or shared libraries (libXm.so.2) in standard path. It does not support multiple arguments yet...
The System and Arch are optional added filters, for example System could be "redhat", "redhat-7.2", "mandrake" or "gnome", Arch could be "i386" or "src", etc. depending on your system.
OverlayFS is the union filesystem provided by Linux kernel. This program comes provides three tools: * vacuum - remove duplicated files in upperdir where copy_up is done but the file is not actually modified (see the sentence "the copy_up may turn out to be unnecessary" in the Linux documentation). This may reduce the size of upperdir without changing lowerdir or overlay. * diff - show the list of actually changed files (the difference between overlay and lowerdir). A file with its type changed (i.e. from symbolic link to regular file) will shown as deleted then added, rather than modified. Similarly, for a opaque directory in upperdir, the corresponding directory in lowerdir (if exists) will be shown as entirely deleted, and a new directory with the same name added. File permission/owner changes will be simply shown as modified. * merge - merge down the changes from upperdir to lowerdir. Unlike aubrsync for AuFS which bypasses the union filesystem mechanism, overlayfs-utils emulates the OverlayFS logic, which will be far more efficient. After this operation, upperdir will be empty and lowerdir will be the same as original overlay. * deref - copy changes from upperdir to uppernew while unfolding redirect directories and metacopy regular files, so that new upperdir is compatible with legacy overlayfs driver. For safety reasons, vacuum and merge will not actually modify the filesystem, but generate a shell script to do the changes instead.
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