# see scripts/kbuild/config-language.txt.
#
-menu "Another Bourne-like Shell"
+menu "Shells"
choice
prompt "Choose your default shell"
- default CONFIG_FEATURE_SH_IS_NONE
+ default 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
+config FEATURE_SH_IS_ASH
+ select ASH
bool "ash"
-config CONFIG_FEATURE_SH_IS_HUSH
- select CONFIG_HUSH
+config FEATURE_SH_IS_HUSH
+ select HUSH
bool "hush"
-config CONFIG_FEATURE_SH_IS_LASH
- select CONFIG_LASH
- bool "lash"
+####config FEATURE_SH_IS_LASH
+#### select LASH
+#### bool "lash"
-config CONFIG_FEATURE_SH_IS_MSH
- select CONFIG_MSH
+config FEATURE_SH_IS_MSH
+ select MSH
bool "msh"
-config CONFIG_FEATURE_SH_IS_NONE
+config FEATURE_SH_IS_NONE
bool "none"
endchoice
-config CONFIG_ASH
+config ASH
bool "ash"
- default y
+ default n
help
Tha 'ash' shell adds about 60k in the default configuration and is
the most complete and most pedantically correct shell included with
(written by Kenneth Almquist) from NetBSD.
comment "Ash Shell Options"
- depends on CONFIG_ASH
+ depends on ASH
-config CONFIG_ASH_JOB_CONTROL
- bool " Enable Job control"
+config ASH_BASH_COMPAT
+ bool "bash-compatible extensions"
default y
- depends on CONFIG_ASH
+ depends on ASH
+ help
+ Enable bash-conpatible extensions.
+
+config ASH_JOB_CONTROL
+ bool "Job control"
+ default y
+ depends on ASH
help
Enable job control in the ash shell.
-config CONFIG_ASH_TIMEOUT
- bool " Enable read timeout support."
- default n
- depends on CONFIG_ASH_JOB_CONTROL
- help
- This option provides read -t <seconds> support.
+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.
- read builtin which allows the function to pass control back
- if no character input is read from the terminal within a set
- number of seconds.
+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 CONFIG_ASH_ALIAS
- bool " Enable alias support"
+config ASH_ALIAS
+ bool "alias support"
default y
- depends on CONFIG_ASH
+ depends on ASH
help
Enable alias support in the ash shell.
-config CONFIG_ASH_MATH_SUPPORT
- bool " Enable Posix math support"
+config ASH_MATH_SUPPORT
+ bool "Posix math support"
default y
- depends on CONFIG_ASH
+ depends on ASH
help
Enable math support in the ash shell.
-config CONFIG_ASH_MATH_SUPPORT_64
- bool " Extend Posix math support to 64 bit"
+config ASH_MATH_SUPPORT_64
+ bool "Extend Posix math support to 64 bit"
default n
- depends on CONFIG_ASH_MATH_SUPPORT
+ 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 CONFIG_ASH_GETOPTS
- bool " Enable getopts builtin to parse positional parameters"
+config ASH_GETOPTS
+ bool "Builtin getopt to parse positional parameters"
default n
- depends on CONFIG_ASH
+ depends on ASH
help
Enable getopts builtin in the ash shell.
-config CONFIG_ASH_CMDCMD
- bool " Enable cmdcmd to override shell builtins"
+config ASH_BUILTIN_ECHO
+ bool "Builtin version of 'echo'"
+ default y
+ depends on ASH
+ help
+ Enable support for echo, builtin to ash.
+
+config ASH_BUILTIN_PRINTF
+ bool "Builtin version of 'printf'"
+ default y
+ depends on ASH
+ help
+ Enable support for printf, builtin to ash.
+
+config ASH_BUILTIN_TEST
+ bool "Builtin version of 'test'"
+ default y
+ 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 CONFIG_ASH
+ 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 CONFIG_ASH_MAIL
- bool " Check for new mail on interactive shells"
+config ASH_MAIL
+ bool "Check for new mail on interactive shells"
default y
- depends on CONFIG_ASH
+ depends on ASH
help
Enable "check for new mail" in the ash shell.
-config CONFIG_ASH_OPTIMIZE_FOR_SIZE
- bool " Optimize for size instead of speed"
+config ASH_OPTIMIZE_FOR_SIZE
+ bool "Optimize for size instead of speed"
default y
- depends on CONFIG_ASH
+ depends on ASH
help
- Compile ash for reduced size at price of speed.
+ Compile ash for reduced size at the price of speed.
-config CONFIG_ASH_RANDOM_SUPPORT
- bool " Enable pseudorandom generator and variable $RANDOM"
+config ASH_RANDOM_SUPPORT
+ bool "Pseudorandom generator and variable $RANDOM"
default n
- depends on CONFIG_ASH
+ depends on ASH
help
Enable pseudorandom generator and dynamic variable "$RANDOM".
Each read of "$RANDOM" will generate a new pseudorandom value.
After "unset RANDOM" then generator will switch off and this
variable will no longer have special treatment.
-config CONFIG_HUSH
+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
help
word ), arithmetic expansion, aliases, brace expansion, tilde
expansion, &> and >& redirection of stdout+stderr, etc.
+config HUSH_HELP
+ bool "help builtin"
+ default n
+ depends on HUSH
+ help
+ Enable help builtin in hush. Code size + ~1 kbyte.
-config CONFIG_LASH
- bool "lash"
+config HUSH_INTERACTIVE
+ bool "Interactive mode"
+ default y
+ depends on HUSH
+ help
+ Enable interactive mode (prompt and command editing).
+ Without this, hush simply reads and executes commands
+ from stdin just like a shell script from the file.
+ No prompt, no PS1/PS2 magic shell variables.
+
+config HUSH_JOB
+ bool "Job control"
default n
+ depends on HUSH_INTERACTIVE
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.
+ Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
+ command (not entire shell), fg/bg builtins work. Without this option,
+ "cmd &" still works by simply spawning a process and immediately
+ prompting for next command (or executing next command in a script),
+ but no separate process group is formed.
+
+config HUSH_TICK
+ bool "Process substitution"
+ default n
+ depends on HUSH
+ help
+ Enable process substitution `command` and $(command) in hush.
+config HUSH_IF
+ bool "Support if/then/elif/else/fi"
+ default n
+ depends on HUSH
+ help
+ Enable if/then/elif/else/fi in hush.
-config CONFIG_MSH
+config HUSH_LOOPS
+ bool "Support for, while and until loops"
+ default n
+ depends on HUSH
+ help
+ Enable for, while and until loops in hush.
+
+config LASH
+ bool "lash"
+ default n
+ select HUSH
+ help
+ lash is deprecated and will be removed, please migrate to hush.
+
+config MSH
bool "msh"
default n
help
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
+ depends on MSH || LASH || HUSH || ASH
-config CONFIG_FEATURE_SH_EXTRA_QUIET
+config FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default n
- depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
+ depends on MSH || LASH || HUSH || ASH
help
Remove the busybox introduction when starting a shell.
-config CONFIG_FEATURE_SH_STANDALONE_SHELL
+config FEATURE_SH_STANDALONE
bool "Standalone shell"
default n
- depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
+ depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
help
- This option causes the selected busybox shell to use busybox applets
+ This option causes busybox shells 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 staticly linked version of busybox
+ 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 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"
+ This is implemented by re-execing /proc/self/exe (typically)
+ with right parameters. Some selected applets ("NOFORK" applets)
+ can even be executed without creating new process.
+ Instead, busybox will call <applet>_main() internally.
+
+ However, this causes problems in chroot jails without mounted /proc
+ and with ps/top (command name can be shown as 'exe' for applets
+ started this way).
+# untrue?
+# 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.
+# untrue?
+# 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 FEATURE_SH_NOFORK
+ bool "Run 'nofork' applets directly"
default n
- depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
+ depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS
help
- Enable command editing in shell.
+ This option causes busybox shells [currently only ash]
+ to not execute typical fork/exec/wait sequence, but call <applet>_main
+ directly, if possible. (Sometimes it is not possible: for example,
+ this is not possible in pipes).
-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".
+ This will be done only for some applets (those which are marked
+ NOFORK in include/applets.h).
-config CONFIG_FEATURE_COMMAND_HISTORY
- int "history size"
- default 15
- depends on CONFIG_FEATURE_COMMAND_EDITING
- help
- Specify command history size in shell.
+ This may significantly speed up some shell scripts.
-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.
+ This feature is relatively new. Use with care.
-config CONFIG_FEATURE_COMMAND_TAB_COMPLETION
- bool "tab completion"
+config CTTYHACK
+ bool "cttyhack"
default n
- depends on CONFIG_FEATURE_COMMAND_EDITING
help
- Enable tab completion in shell.
+ One common problem reported on the mailing list is "can't access tty;
+ job control turned off" error message which typically appears when
+ one tries to use shell with stdin/stdout opened to /dev/console.
+ This device is special - it cannot be a controlling tty.
-config CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
- bool "username completion"
- default n
- depends on CONFIG_FEATURE_COMMAND_TAB_COMPLETION
- help
- Enable username completion in shell.
+ Proper solution is to use correct device instead of /dev/console.
-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.
+ cttyhack provides "quick and dirty" solution to this problem.
+ It analyzes stdin with various ioctls, trying to determine whether
+ it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
+ If it detects one, it closes stdin/out/err and reopens that device.
+ Then it executes given program. Usage example for /etc/inittab
+ (for busybox init):
+
+ ::respawn:/bin/cttyhack /bin/sh
endmenu
projects / oweals / busybox.git / blobdiff