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- renaming extensions
You can get a copy of the chcase perl script here.
For more complex renaming you should read the Section called Mass Rename/copy/link Tools in Chapter 7
Use rel to analyze text files for relevance to a given set of keywords. It outputs the names of those files that are relevant to the given keywords, ranked in order of relevance; if a file does not meet the criteria, it is not outputted in the relevance listing.
- units man page
There is a man page, part of the Linux Programmers Manual called “units”. It displays various information on the various scientific measurements (such as mega, giga et cetera). This manual page also has a short discussion about the argument over which standard should be used to measure data (ie. the kibibyte vs kilobyte).
man 7 units
fortune is a tool which will print a random, hopefully interesting quote or entertaining short piece of writing. There are options to customise which area the epigrams should come from. Just type fortune to get a random epigram from any section.
This information information comes from the Linux Cookbook (without editing). See  in the Bibliography for further information.
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