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10.8 Optional Features

The Bash configure has a number of --enable-feature options, where feature indicates an optional part of Bash. There are also several --with-package options, where package is something like 'bash-malloc' or 'purify'. To turn off the default use of a package, use --without-package. To configure Bash without a feature that is enabled by default, use --disable-feature.

Here is a complete list of the --enable- and --with- options that the Bash configure recognizes.

Define if you are using the Andrew File System from Transarc.
Use the Bash version of malloc in 'lib/malloc/malloc.c'. This is not the same malloc that appears in GNU libc, but an older version derived from the 4.2 BSD malloc. This malloc is very fast, but wastes some space on each allocation. This option is enabled by default. The 'NOTES' file contains a list of systems for which this should be turned off, and configure disables this option automatically for a number of systems.
Use the curses library instead of the termcap library. This should be supplied if your system has an inadequate or incomplete termcap database.
A synonym for --with-bash-malloc.
Define this to make Bash link with a locally-installed version of Readline rather than the version in 'lib/readline'. This works only with Readline 4.3 and later versions. If PREFIX is yes or not supplied, configure uses the values of the make variables includedir and libdir, which are subdirectories of prefix by default, to find the installed version of Readline if it is not in the standard system include and library directories. If PREFIX is no, Bash links with the version in 'lib/readline'. If PREFIX is set to any other value, configure treats it as a directory pathname and looks for the installed version of Readline in subdirectories of that directory (include files in PREFIX/include and the library in PREFIX/lib).
Define this to use the Purify memory allocation checker from Rational Software.
This produces a shell with minimal features, close to the historical Bourne shell.

There are several --enable- options that alter how Bash is compiled and linked, rather than changing run-time features.

Enable support for large files if the operating system requires special compiler options to build programs which can access large files. This is enabled by default, if the operating system provides large file support.
This builds a Bash binary that produces profiling information to be processed by gprof each time it is executed.
This causes Bash to be linked statically, if gcc is being used. This could be used to build a version to use as root's shell.

The 'minimal-config' option can be used to disable all of the following options, but it is processed first, so individual options may be enabled using 'enable-feature'.

All of the following options except for 'disabled-builtins' and 'xpg-echo-default' are enabled by default, unless the operating system does not provide the necessary support.

Allow alias expansion and include the alias and unalias builtins (see section 6.6 Aliases).
Include support for the alternate form of the for command that behaves like the C language for statement (see section 3.2.4 Looping Constructs).
Include support for one-dimensional array shell variables (see section 6.7 Arrays).
Include support for csh-like history substitution (see section 9.3 History Expansion).
Include csh-like brace expansion ( b{a,b}c ==> bac bbc ). See section 3.5.1 Brace Expansion, for a complete description.
Include support for recognizing time as a reserved word and for displaying timing statistics for the pipeline following time (see section 3.2.2 Pipelines). This allows pipelines as well as shell builtins and functions to be timed.
Include support for the [[ conditional command (see section 3.2.5 Conditional Constructs).
Include support for a csh-like directory stack and the pushd, popd, and dirs builtins (see section 6.8 The Directory Stack).
Allow builtin commands to be invoked via 'builtin xxx' even after xxx has been disabled using 'enable -n xxx'. See section 4.2 Bash Builtin Commands, for details of the builtin and enable builtin commands.
Include support for the ((...)) command (see section 3.2.5 Conditional Constructs).
Include support for the extended pattern matching features described above under section Pattern Matching.
Include the help builtin, which displays help on shell builtins and variables (see section 4.2 Bash Builtin Commands).
Include command history and the fc and history builtin commands (see section 9.1 Bash History Facilities).
This enables the job control features (see section 7 Job Control), if the operating system supports them.
This enables the special handling of filenames of the form /dev/tcp/host/port and /dev/udp/host/port when used in redirections (see section 3.6 Redirections).
This enables process substitution (see section 3.5.6 Process Substitution) if the operating system provides the necessary support.
Turn on the interpretation of a number of backslash-escaped characters in the $PS1, $PS2, $PS3, and $PS4 prompt strings. See section 6.9 Controlling the Prompt, for a complete list of prompt string escape sequences.
Enable the programmable completion facilities (see section 8.6 Programmable Completion). If Readline is not enabled, this option has no effect.
Include support for command-line editing and history with the Bash version of the Readline library (see section 8 Command Line Editing).
Include support for a restricted shell. If this is enabled, Bash, when called as rbash, enters a restricted mode. See section 6.10 The Restricted Shell, for a description of restricted mode.
Include the select builtin, which allows the generation of simple menus (see section 3.2.5 Conditional Constructs).
A synonym for --enable-xpg-echo-default.
Make the echo builtin expand backslash-escaped characters by default, without requiring the -e option. This sets the default value of the xpg_echo shell option to on, which makes the Bash echo behave more like the version specified in the Single Unix Specification, version 2. See section 4.2 Bash Builtin Commands, for a description of the escape sequences that echo recognizes.

The file 'config-top.h' contains C Preprocessor '#define' statements for options which are not settable from configure. Some of these are not meant to be changed; beware of the consequences if you do. Read the comments associated with each definition for more information about its effect.

  Published under the terms of the GNU General Public License Design by Interspire