.\" SCCSID: @(#)lookbib.1	8.1	9/11/90.TH lookbib 1.SH Nameindxbib, lookbib \- build inverted index for a bibliography, lookup bibliographicreferences.SH Syntax.B indxbib\fIdatabase...\fR.br.B lookbib\fIdatabase\fR.SH Description.NXR "lookbib command".NXR "indxbib command".NXA "refer preprocessor" "indxbib command".NXA "refer preprocessor" "lookbib command".NXR "bibliography" "indexing".NXR "bibliography" "finding references"The.PN indxbibmakes an inverted index to the named.I databases(or files) for use by.MS lookbib 1and.MS refer 1 .These files contain bibliographic references(or other kinds of information) separated by blank lines..PPA bibliographic reference is a set of lines,constituting fields of bibliographic information.Each field starts on a line beginning with a ``%'',followed by a key-letter, then a blank,and finally the contents of the field,which may continue until the next line starting with ``%''..PPThe.PN indxbib command is a shell script that calls.PN /usr/lib/refer/mkeyand.PN /usr/lib/refer/inv .The first program,.PN mkey ,truncates words to 6 characters,and maps upper case to lower case.It also discards words shorter than 3 characters,words among the 100 most common English words,and numbers (dates) < 1900 or > 2000.These parameters can be changed. The second program,.I inv,creates an entry file (.ia),a posting file (.ib), and a tag file (.ic),all in the working directory..PPThe.PN lookbibcommand uses an inverted index made by.PN indxbibto find sets of bibliographic references.It reads keywords typed after the ``>'' prompt on the terminal,and retrieves records containing all these keywords.If nothing matches, nothing is returned except another ``>'' prompt..PPIt is possible to search multiple databases,as long as they have a common index made by.PN indxbib .In that case, only the first argument given to.PN indxbibis specified to.PN lookbib ..PPIf.PN lookbibdoes not find the index files (the .i[abc] files),it looks for a reference file with the same name as the argument,without the suffixes.It creates a file with a '.ig' suffix, suitable for use with.PN fgrep .It then uses this fgrep file to find references.This method is simpler to use, but the .ig file is slower to usethan the .i[abc] files,and does not allow the use of multiple reference files..SH Files.IR x \&.ia,.IR x \&.ib,.IR x \&.ic,where .I xis the first argument, or if these are not present, then.IR x \&.ig,.IR x.SH See Alsoaddbib(1), lookbib(1), refer(1), roffbib(1), sortbib(1),