Unarc unpacks an archive and creates a top-level directory to unpack into if it's needed. Unarc works with lots of archives, not just tarballs (bz2, zip, and even rpm are supported). There is a companion program arcdir which provides a uniform way to archive directories into tarfiles, zipfiles, etc.
dirgroup is a Perl script for merging the contents of a directory, /etc/group.d, into the file /etc/group. Storing group information in a directory allows users other than root to own and manage Unix groups. This minor change to Unix permission semantics provides many of the advantages of much more complex ACL systems.
ethstats is a script that quickly measures network device throughput. It works by parsing the /proc/net/dev file that the Linux kernel maintains, and thus utilizes a negligible amount of CPU time. ethstats shows the throughput of each device in both megabits per second and packets per second.
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