
indxbib Command in Linux
The indxbib command in Linux creates an inverted index for bibliographic databases. A bibliographic database is a structured collection of references to academic papers, books, articles, conference proceedings, and other similar materials.
The indxbib command creates an inverted index for use with the refer, lookbib, and lkbib tools.
Table of Contents
Here is a comprehensive guide to the options available with the indxbib command −
- Prerequisites to Use indxbib Command
- Understanding Bibliographic Database
- Syntax of indxbib Command
- Options of indxbib Command
- Examples of indxbib Command in Linux
Prerequisites to Use indxbib Command
The indxbib command is a part of the groff package and may not be available by default on Linux distributions.
To install groff on Ubuntu, Kali Linux, Raspberry Pi OS, Debian, and Debian-based distributions, use the command given below −
sudo apt install groff
To install it on Arch Linux, use −
sudo pacman -S groff
To install it on CentOS, use the following command −
sudo yum install groff
To install groff on Fedora, use the following command −
sudo dnf install groff
To verify if the indxbib command is installed or not, use the following command −
indxbib -v

Understanding Bibliographic Database
Bibliographic databases are divided into records by blank lines. Within each record, fields start with a % character at the beginning of the line, followed by a single-letter name that identifies the field. A list of commonly used letters is given below −
Letter | Description |
---|---|
%a | Author |
%t | Title |
%y | Year of publication |
%p | Publisher |
%i | ISBN (International Standard of Book Number) |
%l | Location |
%d | Date |
%j | Journal Name |
%v | Volume Number |
%n | Issue number |
A typical bibliographic file is shown in the following image −

It is important to note that there are various format types of bibliographic files. The above example shows a BibTeX-like format, which is simpler and can be used in various contexts without complex formatting or specific tools.
Syntax of indxbib Command
The syntax of the Linux indxbib command is as follows −
indxbib [options] [filename]
The [options] field is used to specify the options to change the command behavior, while [filename] is used to specify the bibliographic database file.
Options of indxbib Command
The options of the indxbib command are listed below −
Options | Description |
---|---|
-v | To display the command version |
-w | To index the entire file as a separate record |
-c file | To use the list of common words from the file instead of /usr/share/groff/1.18.1.4/eign |
-d dir | To specify the custom working directory for the index |
-f file | To read the bibliographic file names from the specified file (if the file is a dash (-) then standard input will be read) |
-i string | To ignore fields whose names are in string (default is XYZ) |
-h n | To set the hash table size to a prime number greater or equal to n for faster searching |
-k n | To set the n keys per input record (default is 100) |
-l n | To discard keys shorter than n characters (default is 3) |
-n n | To ignore the n most common words (default is 100) |
-o basename | To name the index file basename.i |
-t n | To truncate n keys (default is 6) |
Examples of indxbib Command in Linux
This section demonstrates the usage of the indxbib command in Linux with examples −
Creating an Inverted Index File
To create an inverted index file of a bibliographic file, use the command given below −
indxbib file.bib
The above command will generate a file.bib.i file in the current working directory as shown in the following image −

To search specific terms from the index file, use the lookbib command in the following way −
lookbib file.i
It will prompt the term to search as shown in the following output image −

Creating an Inverted Index File with a Custom Name
To create an inverted index file with a custom name, use the -o option −
indxbib -oindex file.bib

The above command will generate an inverted index file by the name of index.i in the current working directory.
Creating an Inverted Index File of Multiple Bibliographic Files
To create an inverted index file of multiple bibliographic files, use the -w option with the filenames −
indxbib -w file1.bib file2.bib
Creating an Inverted Index File in a Custom Directory
To create an inverted index file in a custom directory, use the -d option with the directory path −
indxbib -d/home/sam/Documents file.bib
Reading Bibliographic Filenames from a File
To read the bibliographic file names from a file, use the -f option −
indxbib -ffile.txt

Ignoring a Field
To ignore specific fields, use the -i option −
indxbib -iauthor file.bib
The above command ignores any field with the name of the author.
Setting the Number of Keys Per Record
To limit the number of keys per record, use the -k option. For example, to restrict the keys to 25 characters, use the command in the following way −
indxbib -k25 file.bib
Discarding Short Keys
To discard keys shorter than a specific number of characters, use the -l option. To discard keys shorter than four characters, use −
indxbib -l4 file.bib
Truncating Keys
To truncate all the keys to a specific length, use the -t option with the number of characters to be truncated −
indxbib -t4 file.bib
Conclusion
The indxbib command in Linux generates an index file that can be used with tools like lookbib, lkbib, and refer. The indxbib is a handy tool for managing bibliographic data, improving efficiency in handling references and research. It creates a searchable index that saves time and enhances the quality of literature reviews and citations.
In this tutorial, we explained the indxbib command, including its installation, syntax, options, and usage in Linux with examples.