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+#
+# 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 FEATURE_SH_IS_NONE
+ help
+ Choose a shell. The ash shell is the most bash compatible
+ and full featured one.
+
+config FEATURE_SH_IS_ASH
+ select ASH
+ bool "ash"
+
+config FEATURE_SH_IS_HUSH
+ select HUSH
+ bool "hush"
+
+config FEATURE_SH_IS_LASH
+ select LASH
+ bool "lash"
+
+config FEATURE_SH_IS_MSH
+ select MSH
+ bool "msh"
+
+config FEATURE_SH_IS_NONE
+ bool "none"
+
+endchoice
+
+config ASH
+ bool "ash"
+ default n
+ select 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 ASH
+
+config ASH_JOB_CONTROL
+ bool "Job control"
+ default y
+ depends on ASH
+ help
+ Enable job control in the ash shell.
+
+config ASH_READ_NCHARS
+ bool "'read -n N' and 'read -s' support"
+ default n
+ depends on 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 ASH_READ_TIMEOUT
+ bool "'read -t S' support."
+ default n
+ depends on 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 ASH_ALIAS
+ bool "alias support"
+ default y
+ depends on ASH
+ help
+ Enable alias support in the ash shell.
+
+config ASH_MATH_SUPPORT
+ bool "Posix math support"
+ default y
+ depends on ASH
+ help
+ Enable math support in the ash shell.
+
+config ASH_MATH_SUPPORT_64
+ bool "Extend Posix math support to 64 bit"
+ default n
+ depends on 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 ASH_GETOPTS
+ bool "Builtin getopt to parse positional parameters"
+ default n
+ depends on ASH
+ help
+ Enable getopts builtin in the ash shell.
+
+config ASH_BUILTIN_ECHO
+ bool "Builtin version of 'echo'"
+ default y
+ select ECHO
+ depends on ASH
+ help
+ Enable support for echo, builtin to ash.
+
+config ASH_BUILTIN_TEST
+ bool "Builtin version of 'test'"
+ default y
+ select TEST
+ depends on ASH
+ help
+ Enable support for test, builtin to ash.
+
+config ASH_CMDCMD
+ bool "'command' command to override shell builtins"
+ default n
+ depends on 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 ASH_MAIL
+ bool "Check for new mail on interactive shells"
+ default y
+ depends on ASH
+ help
+ Enable "check for new mail" in the ash shell.
+
+config ASH_OPTIMIZE_FOR_SIZE
+ bool "Optimize for size instead of speed"
+ default y
+ depends on ASH
+ help
+ Compile ash for reduced size at the price of speed.
+
+config ASH_RANDOM_SUPPORT
+ bool "Pseudorandom generator and variable $RANDOM"
+ default n
+ depends on ASH
+ help
+ Enable pseudorandom generator and dynamic variable "$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 ASH_EXPAND_PRMT
+ bool "Expand prompt string"
+ default n
+ depends on 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 HUSH
+ bool "hush"
+ default n
+ select TRUE
+ select FALSE
+ select 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 LASH
+ bool "lash"
+ default n
+ select TRUE
+ select FALSE
+ select 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 MSH
+ bool "msh"
+ default n
+ select TRUE
+ select FALSE
+ select 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 MSH || LASH || HUSH || ASH
+
+config FEATURE_SH_EXTRA_QUIET
+ bool "Hide message on interactive shell startup"
+ default n
+ depends on MSH || LASH || HUSH || ASH
+ help
+ Remove the busybox introduction when starting a shell.
+
+config FEATURE_SH_STANDALONE_SHELL
+ bool "Standalone shell"
+ default n
+ depends on MSH || LASH || HUSH || 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.
+
+endmenu