"With GNU id-utils many text-searching tasks become simpler and faster. For example, you can list all files that reference a particular `#include' file throughout a huge source hierarchy, search for all the memos containing references to a project, or automatically invoke an editor on all files containing references to some function or variable. Anyone with a large software project to maintain, or a large set of text files to organize, can benefit from the ID utilities."

"Wipe repeatedly writes special patterns to the file or files to be destroyed, using the fsync() call and/or the O_SYNC bit to force disk access, in order to lessen the chance of data recovery using techniques such as magnetic force microscopy."