An ID database is a binary file containing a list of file names, a list of tokens, and a sparse matrix indicating which tokens appear in which files.
With this database and some tools to query it (described in this
manual), 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.
Although the name `ID' is short for `identifier', the ID utilities handle more than just identifiers; they also treat other kinds of tokens, most notably numeric constants, and the contents of certain character strings. Thus, this manual will use the word token as a term that is inclusive of identifiers, numbers and strings.
There are several programs in the ID utilities family:
In addition, the ID utilities have historically provided several query programs which are specializations of lid:
Please report bugs to ‘email@example.com’. Remember to include the version number, machine architecture, input files, and any other information needed to reproduce the bug: your input, what you expected, what you got, and why it is wrong. Diffs are welcome, but please include a description of the problem as well, since this is sometimes difficult to infer. See Bugs.