# # For a description of the syntax of this configuration file, # see scripts/kbuild/config-language.txt. # menu "Shells" choice prompt "Choose your default shell" default CONFIG_FEATURE_SH_IS_NONE help Choose a shell. The ash shell is the most bash compatible and full featured one. config CONFIG_FEATURE_SH_IS_ASH select CONFIG_ASH bool "ash" config CONFIG_FEATURE_SH_IS_HUSH select CONFIG_HUSH bool "hush" config CONFIG_FEATURE_SH_IS_LASH select CONFIG_LASH bool "lash" config CONFIG_FEATURE_SH_IS_MSH select CONFIG_MSH bool "msh" config CONFIG_FEATURE_SH_IS_NONE bool "none" endchoice config CONFIG_ASH bool "ash" default n select CONFIG_TEST help Tha 'ash' shell adds about 60k in the default configuration and is the most complete and most pedantically correct shell included with busybox. This shell is actually a derivative of the Debian 'dash' shell (by Herbert Xu), which was created by porting the 'ash' shell (written by Kenneth Almquist) from NetBSD. comment "Ash Shell Options" depends on CONFIG_ASH config CONFIG_ASH_JOB_CONTROL bool "Job control" default y depends on CONFIG_ASH help Enable job control in the ash shell. config CONFIG_ASH_READ_NCHARS bool "'read -n N' and 'read -s' support" default n depends on CONFIG_ASH help 'read -n N' will return a value after N characters have been read. 'read -s' will read without echoing the user's input. config CONFIG_ASH_READ_TIMEOUT bool "'read -t S' support." default n depends on CONFIG_ASH help 'read -t S' will return a value after S seconds have passed. This implementation will allow fractional seconds, expressed as a decimal fraction, e.g. 'read -t 2.5 foo'. config CONFIG_ASH_ALIAS bool "alias support" default y depends on CONFIG_ASH help Enable alias support in the ash shell. config CONFIG_ASH_MATH_SUPPORT bool "Posix math support" default y depends on CONFIG_ASH help Enable math support in the ash shell. config CONFIG_ASH_MATH_SUPPORT_64 bool "Extend Posix math support to 64 bit" default n depends on CONFIG_ASH_MATH_SUPPORT help Enable 64-bit math support in the ash shell. This will make the shell slightly larger, but will allow computation with very large numbers. config CONFIG_ASH_GETOPTS bool "Builtin getopt to parse positional parameters" default n depends on CONFIG_ASH help Enable getopts builtin in the ash shell. config CONFIG_ASH_BUILTIN_ECHO bool "Builtin version of 'echo'" default y select CONFIG_ECHO depends on CONFIG_ASH help Enable support for echo, built in to ash. config CONFIG_ASH_BUILTIN_TEST bool "Builtin version of 'test'" default y select CONFIG_TEST depends on CONFIG_ASH help Enable support for test, built in to ash. config CONFIG_ASH_CMDCMD bool "'command' command to override shell builtins" default n depends on CONFIG_ASH help Enable support for the ash 'command' builtin, which allows you to run the specified command with the specified arguments, even when there is an ash builtin command with the same name. config CONFIG_ASH_MAIL bool "Check for new mail on interactive shells" default y depends on CONFIG_ASH help Enable "check for new mail" in the ash shell. config CONFIG_ASH_OPTIMIZE_FOR_SIZE bool "Optimize for size instead of speed" default y depends on CONFIG_ASH help Compile ash for reduced size at the price of speed. config CONFIG_ASH_RANDOM_SUPPORT bool "Pseudorandom generator and variable $RANDOM" default n depends on CONFIG_ASH help Enable pseudorandom generator and dynamic variable "$RANDOM". Each read of "$RANDOM" will generate a new pseudorandom value. You can reset the generator by using a specified start value. After "unset RANDOM" then generator will switch off and this variable will no longer have special treatment. config CONFIG_ASH_EXPAND_PRMT bool "Expand prompt string" default n depends on CONFIG_ASH help "PS#" may be contain volatile content, such as backquote commands. This option recreates the prompt string from the environment variable each time it is displayed. config CONFIG_HUSH bool "hush" default n select CONFIG_TRUE select CONFIG_FALSE select CONFIG_TEST help hush is a very small shell (just 18k) and it has fairly complete Bourne shell grammar. It even handles all the normal flow control options such as if/then/elif/else/fi, for/in/do/done, while loops, etc. It does not handle case/esac, select, function, here documents ( << word ), arithmetic expansion, aliases, brace expansion, tilde expansion, &> and >& redirection of stdout+stderr, etc. config CONFIG_LASH bool "lash" default n select CONFIG_TRUE select CONFIG_FALSE select CONFIG_TEST help lash is the very smallest shell (adds just 10k) and it is quite usable as a command prompt, but it is not suitable for any but the most trivial scripting (such as an initrd that calls insmod a few times) since it does not understand any Bourne shell grammar. It does handle pipes, redirects, and job control though. Adding in command editing makes it a very nice lightweight command prompt. config CONFIG_MSH bool "msh" default n select CONFIG_TRUE select CONFIG_FALSE select CONFIG_TEST help The minix shell (adds just 30k) is quite complete and handles things like for/do/done, case/esac and all the things you expect a Bourne shell to do. It is not always pedantically correct about Bourne shell grammar (try running the shell testscript "tests/sh.testcases" on it and compare vs bash) but for most things it works quite well. It also uses only vfork, so it can be used on uClinux systems. comment "Bourne Shell Options" depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH config CONFIG_FEATURE_SH_EXTRA_QUIET bool "Hide message on interactive shell startup" default n depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH help Remove the busybox introduction when starting a shell. config CONFIG_FEATURE_SH_STANDALONE_SHELL bool "Standalone shell" default n depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH help This option causes the selected busybox shell to use busybox applets in preference to executables in the PATH whenever possible. For example, entering the command 'ifconfig' into the shell would cause busybox to use the ifconfig busybox applet. Specifying the fully qualified executable name, such as '/sbin/ifconfig' will still execute the /sbin/ifconfig executable on the filesystem. This option is generally used when creating a statically linked version of busybox for use as a rescue shell, in the event that you screw up your system. Note that this will *also* cause applets to take precedence over shell builtins of the same name. So turning this on will eliminate any performance gained by turning on the builtin "echo" and "test" commands in ash. Note that when using this option, the shell will attempt to directly run '/bin/busybox'. If you do not have the busybox binary sitting in that exact location with that exact name, this option will not work at all. config CONFIG_FEATURE_COMMAND_EDITING bool "Command line editing" default n depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH help Enable command editing in shell. config CONFIG_FEATURE_COMMAND_EDITING_VI bool "vi-style line editing commands" default n depends on CONFIG_FEATURE_COMMAND_EDITING help Enable vi-style line editing in the shell. This mode can be turned on and off with "set -o vi" and "set +o vi". config CONFIG_FEATURE_COMMAND_HISTORY int "History size" default 15 depends on CONFIG_FEATURE_COMMAND_EDITING help Specify command history size in shell. config CONFIG_FEATURE_COMMAND_SAVEHISTORY bool "History saving" default n depends on CONFIG_ASH && CONFIG_FEATURE_COMMAND_EDITING help Enable history saving in ash shell. config CONFIG_FEATURE_COMMAND_TAB_COMPLETION bool "Tab completion" default n depends on CONFIG_FEATURE_COMMAND_EDITING help Enable tab completion in shell. config CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION bool "Username completion" default n depends on CONFIG_FEATURE_COMMAND_TAB_COMPLETION help Enable username completion in shell. config CONFIG_FEATURE_SH_FANCY_PROMPT bool "Fancy shell prompts" default n depends on CONFIG_FEATURE_COMMAND_EDITING help Setting this option allows for prompts to use things like \w and \$ and also using escape codes. endmenu