menu "Shells"
-choice
- prompt "Choose your default shell"
- default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
- help
- Choose a shell. The ash shell is the most bash compatible
- and full featured one.
-
-config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
- select BUSYBOX_CONFIG_ASH
- bool "ash"
-
-config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH
- select BUSYBOX_CONFIG_HUSH
- bool "hush"
-
-config BUSYBOX_CONFIG_FEATURE_SH_IS_LASH
- select BUSYBOX_CONFIG_LASH
- bool "lash"
-
-config BUSYBOX_CONFIG_FEATURE_SH_IS_MSH
- select BUSYBOX_CONFIG_MSH
- bool "msh"
-config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE
- bool "none"
-
-endchoice
config BUSYBOX_CONFIG_ASH
bool "ash"
default y
- select BUSYBOX_CONFIG_TEST
+ depends on !BUSYBOX_CONFIG_NOMMU
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'
+ 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"
+config BUSYBOX_CONFIG_ASH_BASH_COMPAT
+ bool "bash-compatible extensions"
+ default y
depends on BUSYBOX_CONFIG_ASH
+ help
+ Enable bash-compatible extensions.
config BUSYBOX_CONFIG_ASH_JOB_CONTROL
bool "Job control"
help
Enable job control in the ash shell.
-config BUSYBOX_CONFIG_ASH_READ_NCHARS
- bool "'read -n N' and 'read -s' support"
- default n
- depends on BUSYBOX_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 BUSYBOX_CONFIG_ASH_READ_TIMEOUT
- bool "'read -t S' support."
- default y
- depends on BUSYBOX_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 BUSYBOX_CONFIG_ASH_ALIAS
bool "alias support"
default y
help
Enable alias support in the ash shell.
-config BUSYBOX_CONFIG_ASH_MATH_SUPPORT
- bool "Posix math support"
- default y
- depends on BUSYBOX_CONFIG_ASH
- help
- Enable math support in the ash shell.
-
-config BUSYBOX_CONFIG_ASH_MATH_SUPPORT_64
- bool "Extend Posix math support to 64 bit"
- default n
- depends on BUSYBOX_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 BUSYBOX_CONFIG_ASH_GETOPTS
bool "Builtin getopt to parse positional parameters"
default y
config BUSYBOX_CONFIG_ASH_BUILTIN_ECHO
bool "Builtin version of 'echo'"
default y
- select BUSYBOX_CONFIG_ECHO
depends on BUSYBOX_CONFIG_ASH
help
- Enable support for echo, built in to ash.
+ Enable support for echo, builtin to ash.
+
+config BUSYBOX_CONFIG_ASH_BUILTIN_PRINTF
+ bool "Builtin version of 'printf'"
+ default y
+ depends on BUSYBOX_CONFIG_ASH
+ help
+ Enable support for printf, builtin to ash.
config BUSYBOX_CONFIG_ASH_BUILTIN_TEST
bool "Builtin version of 'test'"
default y
- select BUSYBOX_CONFIG_TEST
depends on BUSYBOX_CONFIG_ASH
help
- Enable support for test, built in to ash.
+ Enable support for test, builtin to ash.
config BUSYBOX_CONFIG_ASH_CMDCMD
bool "'command' command to override shell builtins"
config BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE
bool "Optimize for size instead of speed"
- default y
+ default n
depends on BUSYBOX_CONFIG_ASH
help
Compile ash for reduced size at the price of speed.
config BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT
- bool "Pseudorandom generator and variable $RANDOM"
+ bool "Pseudorandom generator and $RANDOM variable"
default n
depends on BUSYBOX_CONFIG_ASH
help
Enable pseudorandom generator and dynamic variable "$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
+ After "unset RANDOM" the generator will switch off and this
variable will no longer have special treatment.
config BUSYBOX_CONFIG_ASH_EXPAND_PRMT
bool "Expand prompt string"
- default n
+ default y
depends on BUSYBOX_CONFIG_ASH
help
- "PS#" may be contain volatile content, such as backquote commands.
+ "PS#" may contain volatile content, such as backquote commands.
This option recreates the prompt string from the environment
variable each time it is displayed.
config BUSYBOX_CONFIG_HUSH
bool "hush"
default n
- select BUSYBOX_CONFIG_TRUE
- select BUSYBOX_CONFIG_FALSE
- select BUSYBOX_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.
+ hush is a small shell (22k). It handles the normal flow control
+ constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
+ case/esac. Redirections, here documents, $((arithmetic))
+ and functions are supported.
- It does not handle case/esac, select, function, here documents ( <<
- word ), arithmetic expansion, aliases, brace expansion, tilde
- expansion, &> and >& redirection of stdout+stderr, etc.
+ It will compile and work on no-mmu systems.
+ It does not handle select, aliases, brace expansion,
+ tilde expansion, &>file and >&file redirection of stdout+stderr.
-config BUSYBOX_CONFIG_LASH
- bool "lash"
+config BUSYBOX_CONFIG_HUSH_BASH_COMPAT
+ bool "bash-compatible extensions"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable bash-compatible extensions.
+
+config BUSYBOX_CONFIG_HUSH_HELP
+ bool "help builtin"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable help builtin in hush. Code size + ~1 kbyte.
+
+config BUSYBOX_CONFIG_HUSH_INTERACTIVE
+ bool "Interactive mode"
+ default y
+ depends on BUSYBOX_CONFIG_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 a file.
+ No prompt, no PS1/PS2 magic shell variables.
+
+config BUSYBOX_CONFIG_HUSH_JOB
+ bool "Job control"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH_INTERACTIVE
+ help
+ 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 BUSYBOX_CONFIG_HUSH_TICK
+ bool "Process substitution"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable process substitution `command` and $(command) in hush.
+
+config BUSYBOX_CONFIG_HUSH_IF
+ bool "Support if/then/elif/else/fi"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable if/then/elif/else/fi in hush.
+
+config BUSYBOX_CONFIG_HUSH_LOOPS
+ bool "Support for, while and until loops"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable for, while and until loops in hush.
+
+config BUSYBOX_CONFIG_HUSH_CASE
+ bool "Support case ... esac statement"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable case ... esac statement in hush. +400 bytes.
+
+config BUSYBOX_CONFIG_HUSH_FUNCTIONS
+ bool "Support funcname() { commands; } syntax"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable support for shell functions in hush. +800 bytes.
+
+config BUSYBOX_CONFIG_HUSH_LOCAL
+ bool "Support local builtin"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH_FUNCTIONS
+ help
+ Enable support for local variables in functions.
+
+config BUSYBOX_CONFIG_HUSH_EXPORT_N
+ bool "Support export '-n' option"
+ default y
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable support for export '-n' option in hush. It is a bash extension.
+
+config BUSYBOX_CONFIG_HUSH_RANDOM_SUPPORT
+ bool "Pseudorandom generator and $RANDOM variable"
default n
- select BUSYBOX_CONFIG_TRUE
- select BUSYBOX_CONFIG_FALSE
- select BUSYBOX_CONFIG_TEST
+ depends on BUSYBOX_CONFIG_HUSH
+ help
+ Enable pseudorandom generator and dynamic variable "$RANDOM".
+ Each read of "$RANDOM" will generate a new pseudorandom value.
+
+
+choice
+ prompt "Choose which shell is aliased to 'sh' name"
+ default BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
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.
+ Choose which shell you want to be executed by 'sh' alias.
+ The ash shell is the most bash compatible and full featured one.
+# note: cannot use "select ASH" here, it breaks "make allnoconfig"
+config BUSYBOX_CONFIG_FEATURE_SH_IS_ASH
+ depends on BUSYBOX_CONFIG_ASH
+ bool "ash"
+ depends on !BUSYBOX_CONFIG_NOMMU
+
+config BUSYBOX_CONFIG_FEATURE_SH_IS_HUSH
+ depends on BUSYBOX_CONFIG_HUSH
+ bool "hush"
+
+config BUSYBOX_CONFIG_FEATURE_SH_IS_NONE
+ bool "none"
+
+endchoice
+
+choice
+ prompt "Choose which shell is aliased to 'bash' name"
+ default BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
+ help
+ Choose which shell you want to be executed by 'bash' alias.
+ The ash shell is the most bash compatible and full featured one.
+
+ Note that selecting this option does not switch on any bash
+ compatibility code. It merely makes it possible to install
+ /bin/bash (sym)link and run scripts which start with
+ #!/bin/bash line.
+
+ Many systems use it in scripts which use bash-specific features,
+ even simple ones like $RANDOM. Without this option, busybox
+ can't be used for running them because it won't recongnize
+ "bash" as a supported applet name.
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_ASH
+ depends on BUSYBOX_CONFIG_ASH
+ bool "ash"
+ depends on !BUSYBOX_CONFIG_NOMMU
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_HUSH
+ depends on BUSYBOX_CONFIG_HUSH
+ bool "hush"
+
+config BUSYBOX_CONFIG_FEATURE_BASH_IS_NONE
+ bool "none"
+
+endchoice
+
+
+config BUSYBOX_CONFIG_LASH
+ bool "lash (deprecated: aliased to hush)"
+ default n
+ select BUSYBOX_CONFIG_HUSH
+ help
+ lash is deprecated and will be removed, please migrate to hush.
config BUSYBOX_CONFIG_MSH
- bool "msh"
+ bool "msh (deprecated: please use hush)"
default n
- select BUSYBOX_CONFIG_TRUE
- select BUSYBOX_CONFIG_FALSE
- select BUSYBOX_CONFIG_TEST
+ select BUSYBOX_CONFIG_HUSH
+ help
+ msh is deprecated and will be removed, please migrate to hush.
+ If there is a feature msh has but hush does not, please let us know.
+
+# 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 uses only vfork, so it can be used on uClinux systems.
+
+
+config BUSYBOX_CONFIG_SH_MATH_SUPPORT
+ bool "POSIX math support"
+ default y
+ depends on BUSYBOX_CONFIG_ASH || BUSYBOX_CONFIG_HUSH
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.
+ Enable math support in the shell via $((...)) syntax.
-comment "Bourne Shell Options"
- depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
+config BUSYBOX_CONFIG_SH_MATH_SUPPORT_64
+ bool "Extend POSIX math support to 64 bit"
+ default y
+ depends on BUSYBOX_CONFIG_SH_MATH_SUPPORT
+ help
+ Enable 64-bit math support in the shell. This will make the shell
+ slightly larger, but will allow computation with very large numbers.
+ This is not in POSIX, so do not rely on this in portable code.
config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default n
- depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
+ depends on BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
help
Remove the busybox introduction when starting a shell.
-config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE_SHELL
+config BUSYBOX_CONFIG_FEATURE_SH_STANDALONE
bool "Standalone shell"
default n
- depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
+ depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
help
- This option causes the selected busybox shell to use busybox applets
- in preference to executables in the PATH whenever possible. For
+ 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
+ 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
+ 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.
+ 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 BUSYBOX_CONFIG_FEATURE_SH_NOFORK
+ bool "Run 'nofork' applets directly"
+ default n
+ depends on (BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH) && BUSYBOX_CONFIG_FEATURE_PREFER_APPLETS
+ help
+ 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).
- 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.
+ This will be done only for some applets (those which are marked
+ NOFORK in include/applets.h).
-config BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING
- bool "Command line editing"
- default y
- depends on BUSYBOX_CONFIG_MSH || BUSYBOX_CONFIG_LASH || BUSYBOX_CONFIG_HUSH || BUSYBOX_CONFIG_ASH
- help
- Enable command editing in shell.
+ This may significantly speed up some shell scripts.
+
+ This feature is relatively new. Use with care.
-config BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING_VI
- bool "vi-style line editing commands"
+config BUSYBOX_CONFIG_CTTYHACK
+ bool "cttyhack"
default n
- depends on BUSYBOX_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".
+ 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 BUSYBOX_CONFIG_FEATURE_COMMAND_HISTORY
- int "History size"
- default 15
- depends on BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING
- help
- Specify command history size in shell.
+ Proper solution is to use correct device instead of /dev/console.
-config BUSYBOX_CONFIG_FEATURE_COMMAND_SAVEHISTORY
- bool "History saving"
- default n
- depends on BUSYBOX_CONFIG_ASH && BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING
- help
- Enable history saving in ash shell.
+ 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. Opening the device will make
+ that device a controlling tty. This may require cttyhack
+ to be a session leader.
-config BUSYBOX_CONFIG_FEATURE_COMMAND_TAB_COMPLETION
- bool "Tab completion"
- default y
- depends on BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING
- help
- Enable tab completion in shell.
+ Example for /etc/inittab (for busybox init):
-config BUSYBOX_CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
- bool "Username completion"
- default n
- depends on BUSYBOX_CONFIG_FEATURE_COMMAND_TAB_COMPLETION
- help
- Enable username completion in shell.
+ ::respawn:/bin/cttyhack /bin/sh
-config BUSYBOX_CONFIG_FEATURE_SH_FANCY_PROMPT
- bool "Fancy shell prompts"
- default y
- depends on BUSYBOX_CONFIG_FEATURE_COMMAND_EDITING
- help
- Setting this option allows for prompts to use things like \w and
- \$ and also using escape codes.
+ Giving controlling tty to shell running with PID 1:
+
+ $ exec cttyhack sh
+
+ Starting an interactive shell from boot shell script:
+
+ setsid cttyhack sh
endmenu
projects / openwrt.git / blobdiff